EP2986183B1 - A chair adjustment device - Google Patents

A chair adjustment device Download PDF

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Publication number
EP2986183B1
EP2986183B1 EP14722386.1A EP14722386A EP2986183B1 EP 2986183 B1 EP2986183 B1 EP 2986183B1 EP 14722386 A EP14722386 A EP 14722386A EP 2986183 B1 EP2986183 B1 EP 2986183B1
Authority
EP
European Patent Office
Prior art keywords
adjustment device
actuating member
housing
chair adjustment
locking
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.)
Active
Application number
EP14722386.1A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2986183A1 (en
Inventor
Sigmund ØVERENG
Marius Sollie
Magnus BERGH
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.)
Scandinavian Business Seating AS
Original Assignee
Scandinavian Business Seating AS
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 Scandinavian Business Seating AS filed Critical Scandinavian Business Seating AS
Publication of EP2986183A1 publication Critical patent/EP2986183A1/en
Application granted granted Critical
Publication of EP2986183B1 publication Critical patent/EP2986183B1/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
    • A47C1/022—Reclining or easy chairs having independently-adjustable supporting parts
    • A47C1/023—Reclining or easy chairs having independently-adjustable supporting parts the parts being horizontally-adjustable seats ; Expandable seats or the like, e.g. seats with horizontally adjustable parts

Definitions

  • the invention relates to adjustment devices for chairs, and more specifically, an adjustment device for a backrest and/or a seat of a chair, as set out by the preamble of claim 1.
  • the seat may either be adjustable (back and forth) in relation to a fixed backrest, or the backrest may be movable with respect to the seat.
  • JP 9322837 A which discloses a seat provided with guiding grooves, and a slider which slides relatively in the guiding grooves such that the seat may slide back and forth freely against a seat receiving member.
  • the guiding groove(s) is/are provided with a horizontal part sufficient to slide in a horizontal direction, and an inclination part which at the same time gives a vertical displacement.
  • a hook means is provided to connect the seat and the seat receiving member for fixing in the sliding direction.
  • the seat can be adjusted to a suitable depth or inclined according to kinds of work, physique of persons, or ways of sitting.
  • Another example of a chair adjustment device is known from US2005140195 A1 .
  • a chair adjustment device having a housing configured for connection to one of a seat and a backrest, and having a first actuating member slidably arranged in the housing and configured for connection to the other one of the seat and the backrest, characterized by
  • the locking means are operable by the second actuating member via locking control means.
  • the force-transmitting means comprise an engagement member which is movable into a least one gripping position with the first actuating member via an element connected to the second actuating member.
  • the force transmitting means and the element are in one embodiment configured such that the engagement member is moved into a first gripping position when the second actuating member is moved in a first input direction and into a second gripping position when the second actuating member is moved in a second input direction.
  • the locking means comprise
  • the locking control means comprise in one embodiment a locking control member movably supported by the housing and configured for interaction with the second actuation member; and configured for selectively unlocking the first locking means or the second locking means.
  • the locking control member comprises a control element configured for interaction with guiding means on the second actuation member, and a release element arranged and configured to selectively unlock the first or the second locking means when the second actuating member is slidably moved in the housing.
  • first biasing means are configured for releasably maintaining the locking means in a locked state.
  • second biasing means are configured for releasably maintaining the force-transmitting means in a non-engaging position with respect to the first actuating member.
  • the guiding means comprise a slot having a portion that is inclined with respect to the second actuation member longitudinal axis; said inclined portion interconnecting two slot portions that are parallel and aligned with the second actuation member longitudinal axis.
  • first and second input directions are collinear and opposite directions.
  • first and second output directions are collinear and opposite directions.
  • first input direction and the first output direction are parallel and the same directions.
  • second input direction and the second output direction are parallel and the same directions.
  • FIG. 1 shows an office chair having a backrest 42 and a seat 44.
  • a pedestal e.g. equipped with wheels
  • the backrest 42 comprises at its lower end a frame 41 which is slidably supported by rails 45 (only one illustrated) connected to the seat.
  • the backrest 42 is thereby movable back and forth (indicated by the double arrow A) with respect to the seat 44.
  • the distance between the seat leading edge and the backrest is hence adjustable, whereby the chair may be adjusted to suit users of different sizes and heights.
  • An adjustment device 48 is connected to the seat 44, and operated via an operating lever 46.
  • the adjustment device 48 comprises a housing 1 which is connected to the underside of the seat 44 as illustrated in figure 2 , using conventional bolts and screws.
  • the operating lever 46 is rotatably connected to the underside of the seat via a lever bolt 49a and is connected to the adjustment device 48 in a manner which is described below.
  • the adjustment device comprises an output rod 3, which at one end comprises an angled portion 51 which is connected to a bracket 43 on the backrest frame 41.
  • Figure 3A is an illustration of the adjustment device 48 and the operating lever 46, as they may be viewed when removed from the seat.
  • figure 3A shows the adjustment device from the generally opposite direction, i.e. looking into the housing 1 from above.
  • the output rod 3 is arranged in and supported by the housing 1 and is configured for sliding in the directions indicated by the arrows B1 and B2.
  • the angled portion 51 which is configured for connection to the backrest as described above, is arranged at a first free end 3a of the output rod which extends outside the housing 1.
  • the second free end 3b of the output rod extends outside the housing on the opposite side.
  • the operating lever 46 comprises a hole 49b which, together with the bolt 49a (not shown in figure 3A ; see figure 2 ) forms the lever fulcrum when the adjustment device and operating lever are assembled on the seat.
  • the operating lever 46 is thus movable as indicated by the arrows C1 and C2 in figure 3A .
  • the operating lever 46 comprises a peg 47a which is releasably connected to a corresponding slot 47b near the free end of an input rod 2.
  • the input rod 2 is arranged in and supported by the housing 1 and is configured for sliding in the directions indicated by the arrows D1 and D2 in figure 3A .
  • the input rod 2 is held in a longitudinally neutral position (as shown in figure 3A ) by means of a first spring device 5a which connects the input rod 2 to the housing 1.
  • the input rod 2 comprises a guiding structure 15a that is configured for interaction with an input pin 13 (described in more detail below with reference to figures 5 and 6 ).
  • the output rod 3 is arranged to slide in two cut-outs 16a, 16b in the housing 1, and is releasably restrained from translation in a longitudinal direction by two sets of movable locking plates 8a, 8b. Each plate has a central opening through which the output rod extends.
  • the first set of locking plates 8a restrains the output rod 3 from translation in the direction indicated by arrow B1 in figure 3A .
  • the second set of locking plates 8b restrains the output rod 3 from translation in the opposite direction, indicated by arrow B2 in figure 3A .
  • Such restraining of rod movement by inclined plates is well known per se.
  • the restraining force is generated by friction between the locking plate(s) and the rod, and the friction is thus determined by factors such as material properties (e.g.
  • the locking plates are preferably made of a high-tensile steel material. The operation of the movable sets of locking plates is described in further detail later.
  • a rocker arm 4 is rotatably supported on a housing pin which is connected to the housing.
  • the housing pin is not shown per se in figure 3A , but its position is indicated in figure 3A by reference number 19b placed in parentheses (The housing pin 19b is shown in figure 4A and discussed below).
  • the rocker arm 4 is held in a neutral position as shown in figure 3A by means of a second spring device 5b which is installed between a portion of the rocker arm near the housing pin 19b and a portion of the housing wall.
  • Figure 3B is an enlargement of the section marked "T" in figure 3A .
  • the first set of locking plates 8a restrains the output rod 3 from translation in the direction indicated by arrow B1.
  • the first set of locking plates 8a is movably supported at a first end in a housing slot 20a, and can rotate about this end.
  • a first spring 9a positioned between the second end of the first set of locking plates 8a and a supporting element 18a (connected to the housing), provides the first set of locking plates 8a with a preloading force that holds the plates at an inclined angle in a manner which is generally known in the art.
  • the second set of locking plates 8b restrains the output rod 3 from translation in the direction indicated by arrow B2, i.e. in the direction opposite of the one described above (B1).
  • the second set of locking plates 8b is rotatably supported at a first free end, in a housing slot 20b in the housing, and can rotate about this end.
  • a second spring 9b positioned between the second free end of the second set of locking plates 8b and a supporting element 18b, provides the second set of locking plates 8b with a preloading force in a manner similar to the one described above with reference to the first set of locking plates. Because of friction between the second set of locking plates 8b and the output rod 3, the output rod 3 is restrained from translation in the direction indicated by arrow B2.
  • the gaps g between the output pin 14 and sets of locking plates 8a, 8b when the adjustment device is in the neutral state is advantageous because the sets of locking plates 8a, 8b are subjected to wear (due to friction) during use, causing their angle of inclination with respect to the output rod 3 to increase and hence lean more towards the output pin 14 when in the neutral position.
  • the gaps g permit contact to be established between the sets of locking plates 8a, 8b and the output rod 3, even if the sets of locking plates wear and lean more towards the output pin 14.
  • An output pin 14 (which is described in more detail with reference to figure 5 , below) is arranged between the respective second ends of the two sets of locking plates 8a,b.
  • Figure 4A differs from figure 3A in that the rocker arm 4 has been removed for illustrating purposes, and the aforementioned housing pin 19b (on which the rocker arm 4 is rotatably supported), is thus visible.
  • An engagement plate 10 is arranged inside a sleeve 11, both having a central opening through which the output rod extends.
  • the engagement plate material is typically high-tensile steel, while the sleeve material preferably is of a resilient material, such as plastic or neoprene.
  • the plate-and-sleeve assembly 10, 11 is at one end rotatably supported by a rod slot 21 on the input rod 2.
  • the other end of the plate-and-sleeve assembly 10, 11 is held between a pair of fingers 24a,b that are connected to the free end of the rocker arm and extend downwardly and project partly into an arcuate slot 23.
  • Figure 4A illustrates how the engagement plate 10 and sleeve 11 are oriented substantially perpendicular to the output rod 3 longitudinal axis when the rocker arm 4 is in the neutral position, as described previously.
  • FIG 5 the input rod has been removed in order to illustrate a trigger element 6 (shown in figure 5 in a neutral and unbiased position).
  • the trigger element 6 is in the illustrated embodiment a plate-shaped element comprising the aforementioned input pin 13 and output pin 14.
  • the trigger element 6 is rotatably supported on a housing pin 19a, and in the neutral position of the trigger element 6, the output pin 14 is located between, and not touching, the sets of locking plates 8a, 8b.
  • Figure 6 shows the reverse side of the input rod 2 (i.e. the side facing down into the housing when assembled), with a guiding slot 15b configured for receiving the output pin 14 (not shown in figure 6 ; see e.g. figure 3A ) when the input rod 2 is assembled on top of the trigger element 6.
  • the slot 15b has two straight portions, aligned with the longitudinal axis of the input rod 2, and an inclined portion interconnecting the two straight portions. When the adjustment device is in the neutral position, the output pin 14 is located in the middle of the inclined portion, as seen in figure 3A .
  • the invented adjustment device has now been described with its components in an unactuated state. Both sets of locking plates 8a,b are forced (by their respective springs 9a,b) against the output rod 3, preventing output rod movement in either direction.
  • the engagement plate 10 is in a non-activated and non-engaging position. Thus, in this locked state of the adjustment device, the backrest is prevented from moving relative to the seat.
  • the input rod is slightly modified compared to the variant shown in figure 3A , in that the guiding slot 15b is open, whereby the movement of the input pin 13 is better illustrated.
  • Moving the operating lever 46 from an initial position (cf. figure 3A ) in the direction C1 causes the input rod 2 to move in the direction indicated by arrow D1.
  • This movement of the input rod 2 forces the input pin 13 to move in the guiding slot 15b from the middle of the inclined portion (cf. figure 3A ) to (as seen in the figure) the left-hand part of the straight portion of the guiding slot 15b.
  • This movement of the input pin 13 causes the trigger element 6 to rotate about the housing pin 19a (not shown in figure 7 , cf. figure 5 ), whereby the output pin 14 also moves and engages with the first set of locking plates 8a.
  • This movement of the output pin 14 causes the first set of locking plates 8a to rotate in the housing slot 20a (in the drawing: towards the left) and provides the first set of locking plates 8a with an angle which is more perpendicular (i.e. less inclined that in figure 3A ) relative to the output rod 3.
  • the first spring 9a is compressed. This rotation of the first set of locking plates 8a releases the grip on the output rod 3 and allows it to slide in the direction B1.
  • the engagement plate 10 is rotated until it engages with the output rod 3 and the output rod 3 prevents further rotation.
  • the engagement plate 10 is thus locked to the output rod 3 and establishes a rigid connection between the input rod and output rod, whereby the output rod is pushed in the B1 direction.
  • the rocker arm fingers 24a,b no longer support the rotation of the engagement plate 10, and the rocker arm is thus forced to move along in the same direction (the fingers moving in the arcuate slot 23), causing the second spring device 5b to compress.
  • the rocker arm fingers 24a,b performs an arcuate movement (corresponding to the slot 23) having the housing pin 19b as its center of rotation.
  • the second set of locking plates 8b will not prevent the movement, but due to friction between the second set of locking plates 8b and the output rod 3, the second set of locking plates 8b will be slightly rotated in a clockwise direction about the housing slot 20b.
  • the second spring 9b will in effect also be slightly compressed.
  • a flexible member 27b supports the locking second set of plates 8b and together with the second spring 9b it provides more constant friction between the second set of locking plates 8b and the output rod 3, by allowing slight movement of the second set of locking plates 8b.
  • the translation of the input rod 2 in direction D1 is halted when the first spring device 5a is fully compressed.
  • the operating lever 46 can at this point be released.
  • the first spring device 5a forces the input rod 2 (and the operating lever 46) back to the neutral position, but the second set of locking plates 8b prevents translation of the output rod 3.
  • the engagement plate 10 connected to the input rod 2 at the one end and the rocker arm 4 at the other end, is pushed back and slides along the stationary output rod 3.
  • the input rod 2 comes to rest in the neutral position as previously described, and the rocker arm 4 also comes to a rest in the neutral position as previously described, the engagement plate again being positioned substantially perpendicular to the output rod 3.
  • the operating lever 46 can now be engaged again in the same direction as indicated by arrow C1 to further translate the output rod 3 in the direction indicated by arrow D1, or the operating lever 46 can be engaged in an opposite direction to translate the output rod 3 in an opposite direction.
  • the invented adjustment device is thus bidirectional, in that the seatback may easily be moved in either direction (see “A” in figure 1 ) by operating the lever 46 in either the C1 direction or the C2 direction.

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)
EP14722386.1A 2013-04-15 2014-04-02 A chair adjustment device Active EP2986183B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20130510A NO335957B1 (no) 2013-04-15 2013-04-15 Stoljusteringsinnretning
PCT/NO2014/050046 WO2014171838A1 (en) 2013-04-15 2014-04-02 A chair adjustment device

Publications (2)

Publication Number Publication Date
EP2986183A1 EP2986183A1 (en) 2016-02-24
EP2986183B1 true EP2986183B1 (en) 2017-05-17

Family

ID=50680093

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14722386.1A Active EP2986183B1 (en) 2013-04-15 2014-04-02 A chair adjustment device

Country Status (4)

Country Link
EP (1) EP2986183B1 (no)
CN (1) CN105163627B (no)
NO (1) NO335957B1 (no)
WO (1) WO2014171838A1 (no)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202016104352U1 (de) * 2016-08-08 2016-08-18 Ciar S.P.A. Sitzgelegenheit
US10881209B2 (en) 2018-01-12 2021-01-05 L&P Property Management Company Recliner seating mechanism with seat extension

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09322837A (ja) 1996-06-06 1997-12-16 Takano Co Ltd 椅子の座板スライド装置
US5871258A (en) * 1997-10-24 1999-02-16 Steelcase Inc. Chair with novel seat construction
JP2001008766A (ja) * 1999-07-01 2001-01-16 Fuji Kiko Co Ltd テーブル機構付きシートリクライニング装置
US6994400B2 (en) * 2003-12-30 2006-02-07 Hni Technologies Inc. Chair with adjustable seat depth
JP5055918B2 (ja) * 2006-09-28 2012-10-24 アイシン精機株式会社 パワーシートスライド装置
CN200994589Y (zh) * 2006-11-03 2007-12-26 黄余成 办公转椅调节机构
CN201167701Y (zh) * 2008-03-25 2008-12-24 彭乾丰 可方便调节椅背角度的座椅
KR20100059407A (ko) * 2008-11-26 2010-06-04 반도전자통신주식회사 등받이의 위치조절 기능이 구비된 의자
CN201700756U (zh) * 2010-04-12 2011-01-12 陈千奎 椅座可前后调节的椅具底盘
DE202010010115U1 (de) * 2010-07-09 2011-11-21 Bock 1 Gmbh & Co. Kg Mechanik für einen Bürostuhl
CN102100455B (zh) * 2010-12-31 2012-10-03 潘勇生 大班椅椅座前后调节的锁定及释放机构
CN202115379U (zh) * 2011-01-13 2012-01-18 青岛科泰重工机械有限公司 压路机座椅的滑动机构和旋转机构

Also Published As

Publication number Publication date
CN105163627B (zh) 2018-01-26
NO335957B1 (no) 2015-03-30
CN105163627A (zh) 2015-12-16
EP2986183A1 (en) 2016-02-24
WO2014171838A1 (en) 2014-10-23
NO20130510A1 (no) 2014-10-16

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