WO2015117225A1 - Chaise avec mécanisme d'inclinaison de dossier et d'assise accouplé - Google Patents

Chaise avec mécanisme d'inclinaison de dossier et d'assise accouplé Download PDF

Info

Publication number
WO2015117225A1
WO2015117225A1 PCT/CA2015/000063 CA2015000063W WO2015117225A1 WO 2015117225 A1 WO2015117225 A1 WO 2015117225A1 CA 2015000063 W CA2015000063 W CA 2015000063W WO 2015117225 A1 WO2015117225 A1 WO 2015117225A1
Authority
WO
WIPO (PCT)
Prior art keywords
seat
backrest
bracket
chair
tilt mechanism
Prior art date
Application number
PCT/CA2015/000063
Other languages
English (en)
Inventor
Dragomir Ivicevic
Original Assignee
Teknion Limited
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 Teknion Limited filed Critical Teknion Limited
Publication of WO2015117225A1 publication Critical patent/WO2015117225A1/fr

Links

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
    • A47C1/03205—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest having adjustable and lockable inclination

Definitions

  • This disclosure relates generally to chair tilt mechanisms and more particularly to weight balance mechanisms.
  • a good chair provides ergonomic support during long working hours.
  • most task chairs have a high degree of adjustability.
  • Typically task chairs have a mechanism with a tension adjustable backrest that enables the user to make proper adjustments. Increased adjustability ensures a better fit for the occupant with different weight and size requirements while providing adequate support in a range of sitting positions.
  • a desired feature of a task chair mechanism is the rearward backrest tilting motion and its adjustability.
  • Another desired feature of a task chair mechanism is a forward seat tilt in order to relieve pressure on the user's legs during chair tilt operation, however the ability for a task chair mechanism to provide for both rearward backrest tilt and forward seat tilt is difficult to achieve. Complicated adjustment mechanisms can cause undesirable increases in mechanism manufacturing complexity, cost, reliability and general mechanism size.
  • a typical task chair has a multifunction mechanism with a variety of manual adjustments: knobs for back tilt tension, height, knee tilt/lock etc. This requires very complex, heavy, bulky, and expensive mechanisms. Current technology has shown inconsistent performance and usually may not allow users to stop, hold, and relax at a desired position during the rearward tilting motion. Every new chair's occupant is required to fine-tune their difficult adjustments with many knobs in an effort to assure ergonomic seating, thus providing for difficulty in ease of use for chairs that are situated in multipurpose rooms like meeting rooms and the like, wherein chair users may have to continually readjust their chair because of a chair's adjustments set by the previous occupant.
  • the chair mechanism is provided as simple, compact, constructed with just a few main parts, and considered inexpensive, as compared to current chair mechanisms available in the art.
  • a first aspect is a chair tilt mechanism for a chair having a seat and a backrest, the chair tilt mechanism comprising: a seat bracket for connecting to the seat; a backrest bracket for connecting to the backrest; a pivotal connection coupling the seat bracket to the backrest bracket; and a mounting plate for mounting the seat bracket thereto and for coupling the backrest bracket thereto, such that the seat bracket is positioned on one side of the first pivot axis and the backrest bracket is positioned on the other side of the first pivot axis.
  • a second aspect is a chair tilt mechanism such that a seat of the chair is pivotaily connected to a backrest of the chair incorporating the chair tilt mechanism.
  • a seat pivot (e.g. pivotal connection) coupled to a seat is directly mounted to a backrest (e.g. via backrest arms).
  • FIG. 1 is a perspective view of a chair mechanism mounted on a chair
  • FIG. 1A is a perspective view of a further embodiment of the chair of Figure 1 ;
  • FIG. 1 B is a side view of the chair mechanism of Figure 1 ;
  • FIG. 1C is a back view of the chair mechanism of Figure 1 ;
  • FIG. 1 D is a top view of the chair mechanism of Figure 1 ;
  • FIG. 2 is a further perspective view of the chair mechanism of Figure 1 ;
  • Fig. 2A is a back view of the chair mechanism of Figure 2;
  • FIG. 2B is a top view of the chair mechanism of Figure 2;
  • FIG. 2C is a side view of the chair mechanism of Figure 2;
  • FIG. 3, Fig. 3A and Fig. 3B are further side views the chair mechanism of Figure 2;
  • FIG. 4 is an exploded and perspective view of the chair mechanism of Figure 1 ;
  • Fig. 4A is an exploded and perspective view of some parts of the chair mechanism of Figure 1 ;
  • FIG. 5 is an exploded and perspective view of parts of the chair mechanism of Figure 1 ;
  • FIG. 6 is a partial cross section view of the chair mechanism of Figure ;
  • FIG. 7 is a further embodiment of the chair mechanism of Figure 1 ;
  • Fig. 8 is an alternative embodiment of the tilt mechanism of Figure 1 ;
  • Fig. 9 is an exploded view of the tilt mechanism of Figure 8.
  • Fig. 0 is a side view of the tilt mechanism of Figure 8 in operation
  • Fig. 11 is a side view of the tilt mechanism of Figure 8 in rest position
  • Fig. 12 is a side section view of the tilt mechanism of Figure 8.
  • Fig. 13 is a further section view of the tilt mechanism of Figure 8.
  • a perspective view of a tilt mechanism 100 is shown mounted on a chair 30.
  • the chair 30 has a seat 40 coupled to a backrest 42.
  • the seat 40 is mounted on a seat support 51 (e.g. pillar) connected to a base 52 (e.g. a base assembly).
  • the seat support 51 can be a pneumatic height adjustment cylinder mounted to the base 52 with or without casters.
  • a seat support holder 36 is mounted to the seat support 51 (e.g. pneumatic height adjustment cylinder) and coupled to a mounting plate or base 25 (see Figure 2B) in order to connect the tilt mechanism 100 to the seat support holder 36.
  • the backrest 42 can be connected via a backrest arm 34L and a backrest arm 34R to the mounting plate 25 via the tilt mechanism 100.
  • a seat support 39 (e.g. optionally proving for cross support balancing) can be mounted to the tilt mechanism 100 with the one or more fasteners 37 (e.g. screws, bolts, rivets, welds, etc.).
  • Seat 40 can be mounted to the seat support 39 as shown. It is recognized that height of the seat structure 40 with respect to the base 52 can be manually adjusted via a height adjusting lever (not shown). As such, it is recognized that both the seat 40 and the backrest 42 can be connected to the seat support holder 36 via the tilt mechanism 100, as further described below.
  • the tilt mechanism 100 It is the ability of the tilt mechanism 100 to account for both (e.g. simultaneous) rearward backrest 42 tilt and forward seat 40 tilt during operation that can provide for ease and comfort of chair tilt operation, such that the tilt mechanism 100 provides for mounting of both the backrest 42 and seat 40 to the base 52 (via the seat support 51 and associated seat support holder 36). As such, it is an advantage for the tilt mechanism to provide both a rearward tilt to the backrest 42 coupled to a simultaneous forward tilt of the seat 40 via a shared pivotal connection 21 therebetween.
  • FIG. 1A a perspective view from above of the tilt mechanism 100 is shown mounted on the chair 39, for example where backrest mesh 43 is mounted to the backrest 42. It is recognized that for illustrative purposes only and view of the tilt mechanism 100, mesh on the seat 40 is not shown for convenience.
  • Figures 1 B, 1C, 1 D show different planar views of tilt mechanism 100 mounted on the chair 30.
  • FIGs 2, 2a, 2B, 2C show different planar views of tilt mechanism 100 separated from the seat 40 and backrest 42 of the chair 30 (see Figure 1).
  • Backrest connectors 27L and 27R (e.g. also referred to generically as a backrest bracket) attach the tilt mechanism 100 to the backrest arm 34L and backrest arm 34R respectively. It is recognized that a single backrest arm 34L, 34R can be used to connect the backrest 42 to the backrest connector(s) 27R.L, as desired.
  • a seat pivot bracket 26 is mounted to the backrest connectors 27L and 27R (e.g. backrest bracket) via a pivotal connector 21 (e.g.
  • seat biasing member 22 e.g. a leaf spring
  • FIG 7 showing an alternative embodiment of the seat biasing member 22 as a spring 22.
  • the seat biasing member 22 can also be referred to as a resilient member, such that the seat biasing member 22 is biased against forward tilt "F" (see Figure 3B) of the seat support 40 when the tilt mechanism 100 is operated, such that forward tilt refers to a seat back is raised higher from its reference position as a seat front is lowered from its reference position (see Figure 3B).
  • seat forward tilt angle provided by operation of the tilt mechanism 100 can be represented by reference "F", which represents a change in forward tilt angle of the seat 40 between a reference position RP (e.g. when the chair 30 is absent an occupant or the chair occupant is not resting backwards in the chair 30 which causes the tilt mechanism 100 to operate) and a tilt position TP. Therefore, the seat biasing member 22 biases the tilt angle of the seat 40 towards the reference position RP during operation of the tilt mechanism 100, such that the chair occupant must provide a force to overcome the return bias force of the seat biasing member 22 when desired to move the seat 40 into the forward tilt position TP.
  • reference “F” represents a change in forward tilt angle of the seat 40 between a reference position RP (e.g. when the chair 30 is absent an occupant or the chair occupant is not resting backwards in the chair 30 which causes the tilt mechanism 100 to operate) and a tilt position TP. Therefore, the seat biasing member 22 biases the tilt angle of the seat 40 towards the reference position RP
  • the seat support 39 is coupled to both the seat biasing member 22 and the seat pivot bracket 26 via fasteners 37.
  • the pivotal connection 21 is what connects to the seat 40 via the seat bracket 26 and intervening backrest bracket to the seat support 36 and connected base assembly of the chair 30 (e.g. via mounting plate 25).
  • the seat 40 can also be connected (or otherwise coupled) to the seat support 36 and base assembly via the biasing member 22, thus demonstrating that the seat 40 can be displaced (e.g. tilted) in relation to the mounting plate 25 based on the displacement of the biasing member 22 at one end of the seat bracket 26, rotational displacement of the pivotal connection 21 , and/or displacement of the seat bracket 26 away from the biasing member 22.
  • the seat 40 is coupled to the base assembly (e.g. seat support 36 and base 22) via a pair of pivotal connections 18,21 in series between the mounting plate 25 and the seat bracket 26, such that one pivotal connection 18 is associated with (e.g. in) the mounting plate 25 and the other of the pivotal connection 21 is in the seat bracket 26.
  • the backrest 42 is directly attached to one of the pair of pivotal connections 18,21 of the tilt mechanism 100 and is otherwise unsupported by the tilt mechanism 100 and/or remaining chair 30 components, as the remainder of the tilt mechanism 100 component(s) is what supports the one of the pair of pivotal connections 18,21 connected to the backrest 42 (via backrest arms 34R,L) with respect to the chair 30 (e.g. via the mounting plate 25).
  • the backrest bracket (e.g. 27R,L) is used to couple the seat bracket 26 to the mounting plate 25 via the pivotal connections 18,21.
  • the pivotal connector 21 is shared between the backrest bracket 27R,L and the seat bracket 26 while the pivotal connector 18 is shared between the mounting plate 25 and the backrest bracket 27R.L.
  • the tilt mechanism 100 is coupled to the mounting plate 25 and can include the seat biasing member 22, coupled to the seat pivot bracket 26, the backrest connectors 27L and 27R connected to the seat bracket 26 via a pivotal connector 21 to define a first pivot axis 10, and a block arrangement 5 (see Figure 3B) also mounted to the mounting plate 25 and coupled to the backrest connectors 27L and 27R via a pivotal connection 18 (e.g. pin and sleeve arrangement) as further described below.
  • the pivotal connection 18 provides a second pivot axis 11 spaced apart from the first pivot axis 10.
  • the seat pivot bracket 26 is coupled at one end 8 to the mounting plate 25 via the seat biasing member 22 and can be also coupled at another end 9 (e.g. at the first pivot axis 10) to the backrest connectors 27L and 27R and thus to the mounting plate 25 again via the block arrangement 5 in cooperation with the second pivot axis 11.
  • the seat pivot bracket 26 is coupled to the seat support 39, thus coupling the seat 40 to the tilt mechanism 100, and the backrest connectors 27L and 27R is connected to the backrest 42 via arms 34R.34L thus providing for coupling of the backrest 42 to the tilt mechanism 100.
  • the seat biasing member 22 provides for cantilevering of the seat 40 forward of the chair support 51 as connected to the mounting plate 25.
  • first pivot axis 10 can be positioned between the mounting plate 25 and the second pivot axis 11. Further or in alternative, the first pivot axis 10 can be positioned further away from the mounting plate 25 than the second pivot axis 11 is positioned with respect to the mounting plate 25. Preferably, the first pivot axis 10 can be positioned lower than the second pivot axis 11 with respect to the mounting plate 25. Also noted is that the first pivot axis 10 is movable in relative position with respect to an opposing surface of the mounting plate 25. In one embodiment (see figure 3B), the second pivot axis 11 is also movable in relative position with respect to the opposing surface (e.g. block 5) of the mounting plate 25. In another embodiment (see figure 10), the second pivot axis 11 is fixed in position (e..g within sleeve 64 -see Figure 9) with respect to the opposing surface of the mounting plate 25.
  • the seat pivot bracket 26 positions attachment of the seat 40 to the tilt mechanism 100 on one side of the first pivot axis 10 provided by the backrest connectors 27L and 27R and positions attachment of the backrest 42 to the tilt mechanism 100 on the other side of the first pivot axis 10 provided by the backrest connectors 27L and 27R.
  • coupling of the backrest 42 to the mounting plate 25 is via the second pivot axis 11 also provided by the backrest connectors 27L and 27R, such that the first 10 and second 11 pivot axes are spaced apart from one another.
  • connection of the second pivot axis 11 to the mounting plate 25 is via the block arrangement 5 (See figure 3B).
  • FIG. 3 shows a side view of tilt mechanism 100 in the upright position UP.
  • Mechanism 100 can be mounted on the cylinder holder 36 via mounting plate 25.
  • Seat support 39 can be mounted to the tilt mechanism 100 with the fasteners 37 (e.g. at the point of the seat biasing member 22).
  • Seat 40 can be mounted to the seat support 39.
  • FIG. 3A shows a side view of the tilt mechanism 100 in the rearward tilting position RTP.
  • the front portion of the seat biasing member 22 e.g. leaf spring
  • the seat support 39 tilts in conjunction with movement of the seat bracket 26, thus influencing seat back portion of the seat 40 to move up (i.e. the seat 40 moves from the reference position RP to the tilt position TP through seat tilt F as shown in figure 3B) while the seat front portion of the seat 40 moves downwards.
  • seat movement upwards refers to movement away from the base 52 (see Figure 1) while seat movement downwards refers to movement towards the base 52.
  • Fig. 3B shows a side view of the tilt mechanism 100 in the rearward tilting position RTP. Some parts are shown in the cross section view for illustrative purposes.
  • Backrest 42 is connected to the backrest connector 34R.
  • Seat structure 40 is attached to the seat support 39. Back portion of the seat 40 is lifted up as a result of a tilting action of the backrest arm 34R and the backrest 42, as the pivotal connections 21 ,18 are operated about their pivot axes 10,11.
  • Backrest 42 and the backrest arm 34R are shown in a tilting position.
  • pivot of the seat bracket 26 e.g. change in orientation
  • pivot of the seat bracket 26 about the first pivot axis 10 is in a rotational direction opposite to the pivot of the backrest connector end 27L and 27R (e.g. change in orientation) about the second pivot axis 11. It is recognized that pivot of the seat bracket 26 about the first pivot axis 10 is resisted by the seat biasing member 22, as is pivot of the backrest connector end 27L and 27R about the second pivot axis 11.
  • pressure P2 causes rotation (e.g. change in orientation) of the backrest connector end 27L and 27R at the seat pivot 10 axis location, thus providing for the backrest connector arms 34L,R to rotate in one rotational direction (e.g. change in orientation) about the seat pivot 10 axis location and the seat bracket 26 to pivot in the opposite rotational direction (e.g. opposite change in orientation) about the seat pivot 10 axis location to effect forward seat 40 tilt along with rearward backrest 42 tilt.
  • rotational direction e.g. change in orientation
  • the seat bracket 26 to pivot in the opposite rotational direction (e.g. opposite change in orientation) about the seat pivot 10 axis location to effect forward seat 40 tilt along with rearward backrest 42 tilt.
  • Fig. 4 is an exploded and perspective view of the tilt mechanism 100 as an example embodiment.
  • Mechanism base plate 25 can be mounted to the top of the leaf spring 22 (as the seat biasing member).
  • Leaf spring 22 is connected to the seat pivot bracket 26.
  • Backrest connector 34R and 34L are connected to the backrest connector end 27L and 27R.
  • Fig. 4A provides an exploded and perspective view of some parts of tilt mechanism 100, as an embodiment of the pivotal connections 18,21. Exploded view shows assembly of the backrest connector 34R and 34L, the backrest connector end 27L and 27 R and the pivot members (e.g. metal cylinder, pins, etc.) 17 and 18a.
  • Fastener (e.g. screw) 35 can provide affixing (e.g. locking) of backrest connector end 27L and 27 R to the pivot members 17 and 18a.
  • Fig. 5 shows an exploded and perspective view of most parts of tilt mechanism 100.
  • Fastener (e.g. screw) 47 can connect the mechanism base plate 25 and the leaf spring 22 to the cylinder holder 36.
  • Backrest connector 34R and 34L can be connected to the backrest connector end 27L and 27R.
  • Metal cylinder 17 and the metal cylinder 18a can be locked with fastener (e.g. screw) 35 to the backrest connector end 27L and 27R.
  • Metal cylinder 17 and the metal cylinder 18a can be identical, as desired.
  • a friction material (e.g. 1 ⁇ 2 ring) 20 can be positioned (e.g. permanently mounted) to a sliding surface element 16 (e.g. block) of the block arrangement 5.
  • a friction material (e.g. ring) 21a can be positioned (e.g. permanently mounted) to the seat pivot bracket 26, as desired.
  • Block 15 for example providing an inclined or declined surface to the mounting plate 25
  • a material plate 28 e.g. providing a reduced coefficient of friction between clock 15 and block 16
  • Block 15 can have a slippery and/or polished top surface to facilitate a reduced friction environment and therefore facilitate movement of the material plate 28 that is mounted on the sliding surface element 16.
  • Material 1 ⁇ 2 ring 20 can be permanently mounted to the sliding surface element 16. It is also recognized that the friction material 20,21a can be absent from the tilt mechanism 100, as desired.
  • the friction material 20,21a (either completely or partially filling the pivotal connections 18,21) can be provided as a surface coating to one or more of the components of the pivotal connection 18,21.
  • the friction material 20,21a can be comprised of a polymer compound (e.g. plastic, rubber, etc.).
  • the optional friction material 20,21a can facilitate the formation of a plurality of stop or hold positions between the reference position RP and the tilt position TP. It is recognized that the stop or hold positions could be done by more traditional mechanical detents, etc, if the friction material 20,21a is not included in the pivotal connections 18,21. It is also recognized that a friction inhibiting material (e.g. lubricating film such as oil, etc.) could be positioned between the block 15 and the block 16, thus facilitating movement of the block 16 with respect to the block 5.
  • a friction inhibiting material e.g. lubricating film such as oil, etc.
  • FIG. 3B Provided is an example embodiment of the above more generally described tilt mechanism 100 and cooperating chair 30 components.
  • the metal cylinder 17 and 18a can slightly rotate at axis locations 10,11 of the friction material 1 ⁇ 2 ring 20 and the friction material ring 21a.
  • movement lifts the seat pivot bracket 26 away from the leaf spring 22 thus tensioning same, thus causing corresponding movement of the metal cylinder 17 in the pivot connection 21 , and forward tilt of the seat support 39 and the attached seat 40.
  • Lifting action and motion range of the seat 40 is shown by example in the Fig. 3B with a reference arrow P2.
  • actuation of the seat bracket 26 via rearward tilting by pressure P2 of the occupant against the backrest 42 can also reposition the metal cylinder 18a of the pivot connection 18 with respect to the block arrangement 5, since the action can force the sliding surface element 16 to move (e.g. up) along the surface (e.g. incline, decline) of the block 15.
  • the block 16 and block 15 move relative to one another due to the simultaneous pivot of the seat bracket 26 and backrest connector end 27L and 27R about the first pivot axis 10.
  • the sliding surface element 16 would return towards the original starting position (e.g. move forward and down for the example incline surface).
  • Arrow H shows the movement of the sliding surface element 16 with the attached material plate 28 within the block arrangement 5
  • arrow UP shows movement of the seat bracket 26 away from the biasing member 22 (see figure 3B).
  • the movement of the seat bracket 26 under influence of the backrest support arms 34L,R can also bend the (e.g. elastic) leaf spring 22. It is recognized that the leaf spring 22 can bend differently as a result of an occupant's weight, thus providing for variability in the performance of the force of the biasing force supplied by the biasing element 22.
  • the counterbalancing tilt mechanism 100 provides for a self-adjustable weight sensitive seating capability.
  • the metal cylinder 18a can produce a pressure and adequate friction on a bottom inside wall of the friction material 1 ⁇ 2 ring 20 as shown with arrow P1 on the Fig.3B.
  • Some degree of friction and the counter-balancing structure can provide an advantage of the occupant to stop, hold, and relax at any tilting point without using his/her muscles to force stability, however it is recognized that degree of friction between various components of the tilt mechanism 100, or lack thereof, can be varied in design of the tilt mechanism 100 as desired.
  • Tilt mechanism 100 is illustrated throughout the drawings and descriptions. Alternately, the tilt mechanism 100 could function with the some changes.
  • the metal cylinder 17 and 18a could have permanently attached friction material ring and could produce the friction on the metal inside wall of the sliding friction surface element 16 and on the seat pivot 26. Friction material could also be attached on the metal cylinder 17 and 18a, to the seat pivot bracket 26 and to the sliding surface element 16.
  • Tilt mechanism 100 can function without friction material.
  • Leaf spring 22 can provide balancing weight distribution and facilitate the backrest 42 to stay upright with no occupant, however it is recognized that the tilt mechanism 100 could operate with some kind of detent means (not shown), in conjunction with or in replacement of the biasing member 22, to facilitate holding of the tilt mechanism 100 in the reference position RP as shown.
  • Leaf spring could also be positioned on the top of the mechanism base plate 25.
  • leaf spring or any other spring type as the biasing member 22 could have a different location position in the tilt mechanism 100, other than as shown, in order to hold and return the backrest 42 in the upright position with and without the occupant.
  • Drawings show a set of two (2) leaf springs 22. Depending on the size and property of a leaf spring 22 the configuration could have one (1) or more than one leaf spring.
  • Mechanism base plate 25 can be eliminated and replaced with the leaf spring(s) providing the support of the base plate 25 and connection of the tilt mechanism 100 to the chair components 36 and 51.
  • Most parts of the chair 30 and tilt mechanism 100 could be made of variety of a different metal alloys, composite materials, plastic etc.
  • Seat 40 and backrest 42 could be constructed with plastic, metal or other materials. The surface of the seat 40 and backrest 42 could be covered with foam, mash, plastic, metal, fabric, leather and etc.
  • the seat 40 pivot (e.g. pivotal connection 21) is directly mounted to the backrest 42 via the backrest arms 34R,L.
  • a shared pivotal connection e.g. both backrest arms 34R.L and seat bracket 26 are connected to a common pivotal connection 21 in a backrest bracket 27R,L, as compared to other prior art systems having backrests directly connected to the chair base.
  • the tilt mechanism 100 can be provided such that the base 52 is mounted on the pneumatic height adjustment cylinder (seat support 51), which is mounted to the mechanism base plate 25. Further, the mechanism base plate 25 if present is mounted to the biasing member 22, which is directly mounted to the seat pivot bracket 26. As discussed, the seat pivot bracket 26 is directly mounted to the backrest connectors (27R,L) via pivotal connection 21. During recline/tilting motion, the seat pivot 26 moves up away from the biasing element 22 and lifts the seat 40, for example as a forward tilt motion towards the tilt position TP, thus providing for a counterbalancing action. It is also recognized that the chair tilt mechanism 100 can have friction produced with the (e.g. upper) surface of the pivot element 17 on the friction material 21a and/or other friction produced with the (e.g. bottom) surface of the pivot element 18a on the friction material 1 ⁇ 2 20.
  • the chair tilt mechanism 100 can have friction produced with the (e.g. upper) surface of the pivot element 17 on the friction material 21a and/or other friction
  • FIG. 8 shown is an alternative embodiment of the tilt mechanism 100 mounted on the chair 30 (see Figure 1).
  • the chair 30 has the seat 40 coupled to the backrest 42 (see Figure 1) via pivotal connection 21.
  • the seat 40 is mounted on the seat support 51 (e.g. pillar) connected to the base 52 (e.g. a base assembly - see Figure 1).
  • the seat support 51 can be a pneumatic height adjustment cylinder mounted to the base 52 with or without casters.
  • the seat support holder 36 is mounted to the seat support 51 (e.g. pneumatic height adjustment cylinder) and coupled to the mounting plate or base 25 (see Figure 9), in order to connect the tilt mechanism 100 to the seat support holder 36.
  • the backrest 42 can be connected via the backrest arm 34L and the backrest arm 34R to the mounting plate 25 via the tilt mechanism 100.
  • the seat support 39 (e.g. optionally proving for cross support balancing) can be mounted to the tilt mechanism 100 with the one or more fasteners 37 (e.g. screws, bolts, rivets, welds, etc. - see Figure 9).
  • Seat 40 can be mounted to the seat support 39 as shown. It is recognized that height of the seat structure 40 with respect to the base 52 can be manually adjusted via a height adjusting lever (not shown). As such, it is recognized that both the seat 40 and the backrest 42 can be connected to the seat support holder 36 via the tilt mechanism 100, as further described below.
  • tilt mechanism 100 It is the ability of the tilt mechanism 100 to account for simultaneous rearward backrest 42 tilt and forward seat 40 tilt during operation that can provide for ease and comfort of chair tilt operation, such that the tilt mechanism 100 provides for mounting of both the backrest 42 and seat 40 to the base 52 (via the seat support 51 and associated seat support holder 36).
  • tilt mechanism 100 embodiment shown in Figures 8 and 9 can be provided for as the tilt mechanism 100 of the chair 30 shown in Fig. 1A, 1 B, 1C, 1 D.
  • backrest connectors 27L and 27R attach the tilt mechanism 100 to the backrest arm 34L and backrest arm 34R respectively.
  • the seat pivot bracket 26 (shown by example as a first bracket portion 26a and a second bracket portion 26b) is mounted to the backrest connectors 27L and 27R via the pivotal connector 21 (e.g. a pin and sleeve configuration), such that the seat pivot bracket 26 is coupled to both the seat support 39 and the seat biasing member 22 (e.g. a compression spring, a compression bushing, etc. otherwise referred to as resilient member 22).
  • Pivotal connector 21 can include, by example, a pivot member 17 (e.g.
  • First and second bracket portions 26a, b can be connected to one another for form seat bracket 26 by fasteners 68. As such the seat bracket can be connected at one end to the backrest bracket 27R,L and at the other end to the mounting plate 25.
  • the seat biasing member 22 can also be referred to as the resilient member, such that the seat biasing member 22 is biased against forward tilt "F" (see Figure 3A, 3B and Figure 10) of the seat support 40 when the tilt mechanism 100 is operated.
  • seat forward tilt angle provided by operation of the tilt mechanism 100 can be represented by reference "F", which represents a change in forward tilt angle of the seat 40 between the reference position RP (e.g. when the chair 30 is absent an occupant or the chair occupant is not resting backwards in the chair 30 which causes the tilt mechanism 100 to operate) and the tilt position TP.
  • the seat biasing member 22 biases the tilt angle of the seat 40 towards the reference position RP during operation of the tilt mechanism 100, such that the chair occupant must provide a force to overcome the return bias force of the seat biasing member 22 when desired to move the seat 40 into the forward tilt position TP.
  • the seat support 39 (see Figure 9) is coupled to both the seat biasing member 22 and the seat pivot bracket 26 via fasteners 37 and/or any additional fasteners as desired.
  • the pivotal connection 21 connects to the backrest 42 (see Figure 3B) via the seat bracket 26 to the seat support 36 and connected base assembly of the chair 30.
  • the seat 40 can also be coupled to the biasing member 22, thus demonstrating that the seat 40 can be displaced (e.g. tilted) in relation to the mounting plate 25 based on the displacement (e.g. operation such as compression) of the biasing member 22 relative to the seat bracket 26, rotational displacement of the pivotal connection 21 , and/or displacement of the seat bracket 26 away from the biasing member 22 (e.g. about connection 54, for example pivotal - about the end of the mounting plate 25).
  • the connection 54 between the seat bracket 26 and the mounting plate 25 can be provided as a pin 56 and retaining elements 58 (e.g. cotter pin, retaining clip, etc.) for retaining the pin 56 in a sleeve 60.
  • the seat 40 is coupled to the base assembly (e.g. seat support 36) via the pair of pivotal connections 18,21 in series between the mounting plate 25 and the seat bracket 26, e.g. one pivotal connection 18 couples the backrest connectors 27L, 27R to the mounting plate 25 and the other of the pivotal connectors 21 couples the seat bracket 26 to the backrest connectors 27L, 27R.
  • the backrest 42 is directly attached to the backrest connectors 27L, 27R connected with the pair of pivotal connections 18,21 of the tilt mechanism 100.
  • pivotal connector 18 can include pin 62, sleeve 64, and retaining elements 66 (e.g. end caps).
  • the tilt mechanism 100 is coupled to the mounting plate 25 (e.g. via pivot connection 18 and connection 54) and can include the seat biasing member 22 coupled (e.g. via fastener 37 and respective supporting plate 70) to the seat pivot bracket 26, the backrest connectors 27L and 27R connected to the seat pivot bracket 26 via the pivotal connector 21 to define a first pivot axis 10 (see Figure 10), and the backrest connectors 27L and 27R coupled via the pivotal connection 18 (e.g. pin and sleeve arrangement) to the mounting plate, as further described below.
  • the pivotal connection 18 provides the second pivot axis 11 (see Figure 10) spaced apart from the first pivot axis 10.
  • the seat pivot bracket 26 is coupled at one end 8 to the mounting plate 25 via the connection 54 and is also coupled at another end 9 (e.g. at the first pivot axis 10) to the backrest connectors 27L and 27R and thus to the mounting plate 25 again via the pivotal connection 18 in cooperation with the second pivot axis 11.
  • the seat pivot bracket 26 is coupled to the seat support 39, thus coupling the seat 40 to the tilt mechanism 100, and the backrest connectors 27L and 27R are connected to the backrest 42 via arms 34R.34L thus providing for coupling of the backrest 42 to the tilt mechanism 100.
  • the mounting plate 25 provides for cantilevering of the seat 40 forward of the chair support 51 (see Figure 1).
  • the first pivot axis 10 can be positioned adjacent to the mounting plate 25 and spaced apart from the second pivot axis 11 positioned on the mounting plate 25. Further or in alternative, the first pivot axis 10 can be positioned further away from (e.g. positioned to one side of or off of the mounting plate 25) the mounting plate 25 than the second pivot axis 11 is positioned (e.g. positioned on the mounting plate 25) with respect to the mounting plate 25. For example, the first pivot axis 10 can be positioned higher than the second pivot axis 11 with respect to the mounting plate 25.
  • the seat pivot bracket 26 positions attachment of the seat 40 to the tilt mechanism 100 to one side of the first pivot axis 10 provided by the backrest connectors 27L and 27R and positions attachment of the backrest 42 to the tilt mechanism 100 on the other side of the first pivot axis 10 provided by the backrest connectors 27L and 27R.
  • coupling of the backrest 42 to the mounting plate 25 is via the second pivot axis 11 also provided by the backrest connectors 27L and 27R, such that the first 10 and second 11 pivot axes are spaced apart from one another.
  • connection of the second pivot axis 11 to the mounting plate 25 is via the sleeve 64 (See figure 9).
  • the position of the first pivot axis 10 with respect to the mounting plate 25 is variable (e.g. distance between the pivot axis 10 and the mounting plate 25 changes as the tilt mechanism 100 is operated), while the position of the second pivot axis 11 with respect to the mounting plate 25 is fixed (e.g. distance of the pivot axis 11 with respect to the sleeve 64 of the mounting plate 25 remains constant as the tilt mechanism 100 is operated).
  • FIG. 10 shown are side views of tilt mechanism 100 when the backrest 42 (see Figure 3B) is in an upright position UP and in a rearward tilting position RTP.
  • the seat biasing member 22 can provide for bias of the backrest 42 towards the upright position UP.
  • FIG. 11 shows a side view of the tilt mechanism 100 in the upright position UP.
  • Mechanism 100 can be mounted on the cylinder holder 36 via mounting plate 25.
  • Seat support 39 can be mounted to the tilt mechanism 100 with the fasteners 68 (e.g. at the point of the seat biasing member 22).
  • Seat 40 can be mounted to the seat support 39.
  • the seat biasing member 22 e.g.
  • Fig. 10 also shows a side view of the tilt mechanism 100 in the rearward tilting position RTP.
  • Backrest 42 (see Figure 3B) is connected to the backrest connector 34R, 34L.
  • Seat structure 40 (see Figure 3B) is attached to the seat support 39. Back portion of the seat 40 is lifted up as a result of a tilting action of the backrest arm 34R and the backrest 42, as the pivot connections 21 ,18 (see Figure 9) are operated about their pivot axes 10,11.
  • Backrest 42 and the backrest arm 34R are shown in a tilting position.
  • the chair's occupant tilts occupant pressure shown as arrow P2 - see figure 3B
  • movement of the backrest 42 forces the pivot connection 18 to rotate (e.g.
  • pivot of the seat bracket 26 about the first pivot axis 10 is in a rotational direction (e.g. change in orientation) opposite to the pivot of the backrest connector end 27L and 27R (e.g. change in orientation) about the second pivot axis 11 , as evidenced by the angle F in change in orientation of the seat bracket 26 about pivot connection 21 (between TP and RP) . It is recognized that pivot of the seat bracket 26 about the first pivot axis 10 is resisted by the seat biasing member 22, as is pivot of the backrest connector end 27L and 27R about the second pivot axis 11.
  • pressure P2 causes rotation of the backrest connector end 27L and 27R at the seat pivot axis 10 location, thus providing for the backrest connector arms 34L,R to rotate in one rotational direction about the seat pivot 10 axis location (as evidenced by the change in orientation of the backrest 42 about pivot connection 21 (between UP and RTP) and the seat bracket 26 to pivot in the opposite rotational direction about the seat pivot 10 axis location to effect forward seat 40 tilt along with rearward backrest 42 tilt.
  • Tilt mechanism 100 is illustrated throughout the drawings and descriptions. Alternately, the tilt mechanism 100 could function with the some changes. For instance, biasing member 22 can provide balancing weight distribution and facilitate the backrest 42 to stay upright with no occupant, however it is recognized that the tilt mechanism 100 could operate with some kind of detent means (not shown), in conjunction with or in replacement of the biasing member 22, to facilitate holding of the tilt mechanism 100 in the reference position RP as shown. Biasing member 22 could also be positioned on the top of the mechanism base plate 25, rather than on the bottom as shown in Figure 9.
  • leaf spring or any other spring type as the biasing member 22 could have a different location position in the tilt mechanism 100, other than as shown, in order to hold and return the backrest 42 in the upright position with and without the occupant.
  • the seat 40 pivot (e.g. pivotal connection 21) is directly mounted to the backrest 42 via the backrest arms 34R,L.
  • the seat 40 pivot can be advantageous to have the seat 40 pivotally connected to the backrest 42 as compared to other prior art systems having backrests only connected to the chair base independent of the seat bracket 26.
  • the tilt mechanism 100 can be provided such that the base 52 is mounted on the pneumatic height adjustment cylinder (seat support 51), which is mounted to the mechanism base plate 25. Further, the mechanism base plate 25 is coupled to the biasing member 22, which is also coupled to the seat pivot bracket 26. As discussed, the seat pivot bracket 26 is directly connected to the backrest connectors (34R,L) via pivotal connection 21. During recline/tilting motion, the seat pivot 26 moves up and away from the mounting plate 25 via connection 54 and lifts the seat 40, for example as a forward tilt motion towards the tilt position TP, thus providing for a counterbalancing action.
  • a further alternative embodiment can be a hybrid of the tilt mechanisms of Figure 3B and of Figure 9, such that the pivotal connection 18 of Figure 9 could be positioned on a block 5 as in figure 3B, rather than positioned in the sleeve 64 in a body of the mounting plate 25 as shown in figure 9.
  • FIGS 12 and 13 are cross sectional views of the tilt mechanism 100 for the reference and tilted positions respectively, such that evidenced is movement (shown by reference M) of the pivotal connection 21 away from the mounting plate 25 when in the tilt mechanism 100 is in the tilted position.

Abstract

La présente invention concerne un mécanisme de chaise inclinable, avancé au plan ergonomique. Le mécanisme est un mécanisme de contrepoids auto-réglable, sensible au poids et sensiblement simplifié. Des occupants présentant un poids compris dans une large plage de poids peuvent décider du point d'inclinaison auquel se détendre et maintenir la position sans utiliser leur force musculaire. Le poids de l'occupant peut produire une résistance à la tension et une friction adéquates. L'invention concerne un mécanisme d'inclinaison de chaise pour une chaise ayant une assise et un dossier. Le mécanisme d'inclinaison de chaise comprend : un support d'assise afin de se raccorder à l'assise ; un support de dossier afin de se raccorder au dossier ; un raccord pivotant accouplant le support d'assise au support de dossier et définissant un premier axe de pivot ; et une plaque de montage afin de monter le support d'assise sur celle-ci et d'accoupler le support de dossier à celle-ci, de sorte que le support d'assise soit positionné sur un côté du premier axe de pivot et que le support de dossier soit positionné sur l'autre côté du premier axe de pivot.
PCT/CA2015/000063 2014-02-04 2015-02-04 Chaise avec mécanisme d'inclinaison de dossier et d'assise accouplé WO2015117225A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US201461935505P 2014-02-04 2014-02-04
US61/935,505 2014-02-04
CA2842019A CA2842019A1 (fr) 2014-02-04 2014-02-04 Fauteuil incline auto ajustable dote d'un mecanisme cantilever
CA2,842,019 2014-02-04

Publications (1)

Publication Number Publication Date
WO2015117225A1 true WO2015117225A1 (fr) 2015-08-13

Family

ID=53777088

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CA2015/000063 WO2015117225A1 (fr) 2014-02-04 2015-02-04 Chaise avec mécanisme d'inclinaison de dossier et d'assise accouplé

Country Status (2)

Country Link
CA (1) CA2842019A1 (fr)
WO (1) WO2015117225A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4364605A (en) * 1979-07-20 1982-12-21 Willibald Grammer Seat with a seat plate of adjustable inclination and a backrest of adjustable inclination
US20020163234A1 (en) * 1998-07-27 2002-11-07 Ashfield Engineering Company Wexford Limited Chair
US6513874B1 (en) * 1999-06-17 2003-02-04 Konig & Neurath Ag Chair, especially office chair
US20080238165A1 (en) * 2003-10-24 2008-10-02 Paul Matthew Freestone Recline Mechanism For Seating Furniture
US20080272638A1 (en) * 2005-04-28 2008-11-06 Bock 1 Gmbh & Co. Kg Synchronization Mechanism

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4364605A (en) * 1979-07-20 1982-12-21 Willibald Grammer Seat with a seat plate of adjustable inclination and a backrest of adjustable inclination
US20020163234A1 (en) * 1998-07-27 2002-11-07 Ashfield Engineering Company Wexford Limited Chair
US6513874B1 (en) * 1999-06-17 2003-02-04 Konig & Neurath Ag Chair, especially office chair
US20080238165A1 (en) * 2003-10-24 2008-10-02 Paul Matthew Freestone Recline Mechanism For Seating Furniture
US20080272638A1 (en) * 2005-04-28 2008-11-06 Bock 1 Gmbh & Co. Kg Synchronization Mechanism

Also Published As

Publication number Publication date
CA2842019A1 (fr) 2015-08-04

Similar Documents

Publication Publication Date Title
US7234775B2 (en) Dynamically balanced seat assembly having independently and arcuately movable seat and backrest and method
US7048335B2 (en) Seating unit with crossbar seat support
US7837265B2 (en) Reclining chair with enhanced adjustability
US6969116B2 (en) Chair with backward and forward passive tilt capabilities
US9277821B2 (en) Tilt mechanism for a chair and chair
JP3330145B2 (ja) 椅子の背，座部の連動支持機構
CN105792706A (zh) 用于座椅家具的倾斜机构以及包括所述倾斜机构的座椅家具
WO2004037042A2 (fr) Chaise empilable
JP2003024175A (ja) 椅子の背もたれの支持機構
JP4139812B2 (ja) 着席装置用に適した可動継手
US7431397B2 (en) Chair
KR101691858B1 (ko) 의자 어셈블리
WO2015117225A1 (fr) Chaise avec mécanisme d'inclinaison de dossier et d'assise accouplé
CN111511252A (zh) 座椅模块
KR20170004293U (ko) 의자 좌판 경사장치
JP7191418B2 (ja) 椅子類のための同期機構及び椅子類
KR101232984B1 (ko) 의자 좌판 경사장치
KR102303651B1 (ko) 의자용 좌판의 국부 변동 구조
KR101367001B1 (ko) 의자 좌판 경사장치
CN107397364B (zh) 用于休闲椅的阻尼调节机构
CA2911662C (fr) Support lombaire courbe progressivement destine au dossier d'une chaise
JPH0919340A (ja) 椅 子
JP2004248980A (ja) 椅子
JPH0255007A (ja) 椅子
CA2528422A1 (fr) Commande de siege assurant le mouvement synchronise du fond et du dossier du siege, et siege ainsi equipe

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 15746540

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 15746540

Country of ref document: EP

Kind code of ref document: A1