JP2008018239A - Chair with seat and backrest with syncronized movement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a load operating chair, having simple, economical and small-sized structure. <P>SOLUTION: This chair includes: a support base 12; a seat 14 including a movable support structure 38; and a backrest 16 having the support structure 22 connected to the support base and rocking in the periphery of a transverse shaft 28, wherein the seat 14 is connected to the backrest 16 so that when the backrest is located in the most forward tilting position, the seat is located in the lowered position, and when the backrest is located in the most backward tilting position, it is located in the elevated position, the seat support structure 38 is connected to the support base 12 by a rocking lever 58 connected to the support base 12 and the seat support structure 38 in the periphery of the transverse shafts 60, 62, the backrest support structure 22 includes two side parts 26 having a connecting part 34 extended to the support base 12 over a joint shaft 28 of the backrest 16, and the connecting parts 34 are connected to the seat support structure 38 in the periphery of a transverse shaft 56 disposed in front of the joint shaft 28 of the backrest 16. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a chair in which a seat and a backrest are interlocked.

  More specifically, the present invention relates to a support base, a seat movable with respect to the support base between a lowered position and a raised position, and connected to the support base around a transverse axis, and a forward tilt position and a final tilt position. A backrest swinging about the transverse axis between the seat and the backrest. When the backrest is in the forwardmost tilt position, the seat is in the lowered position, and when the backrest is in the last tilted position, the seat is raised The chairs are connected to each other so that they are in position.

  A chair of the type described above is known as a “loading chair”. The user's weight tries to push the seat downward and keep the backrest in the forward tilt position. When the user puts his weight on the backrest, the backward thrust contrasts with the user's weight put on the seat. Such a chair usually includes an elastic device that urges the seat back toward the position where the seat is seated, and urges the backrest toward the forward-most tilted position. Both must be overcome, with the elastic force trying to keep the backrest in the forward tilt position.

  The object of the present invention is to provide a chair of the type described above which has a simpler, more economical and smaller structure than before.

  According to the present invention, the object is to connect a support base, a seat including a support structure movable with respect to the support base between a lowered position and a raised position, and the support base around a transverse axis. And a backrest having a support structure that swings between a most forward tilt position and a last tilt position about the transverse axis, wherein the seat and the backrest are configured so that when the backrest is in the forward tilt position, The seat support structure is connected to each other about transverse axes parallel to each other such that the seat is in the lowered position and the seat is in the raised position when the backrest is in the last tilted position. The support structure of the backrest is connected to the support base by at least one swing lever connected to the support structure of the base and the backrest. Two sides having a connection extending beyond the joint axis to the support base, the connection being about the transverse axis arranged forward with respect to the joint axis of the backrest. This is achieved by a chair characterized in that it is connected to a support structure.

  The chair according to the invention will now be described in detail with reference to the accompanying drawings, which are provided purely as non-limiting examples.

  1 and 2, reference numeral 10 indicates a chair according to the present invention. The chair 10 includes a fixed support base 12, a seat 14 and a backrest 16.

  The support base 12 includes a groove-type cross member 18 provided with two flanges 20 extending upward at its side ends. The support base 12 is a vertical central vertical member that protrudes upward from a support formed by a plurality of radial arms provided with casters at the outer ends thereof in accordance with an arrangement widely known in the office chair manufacturing industry. (Not shown) is connected to be adjustable in height.

  The backrest 16 includes a support structure 22 that receives the template 24 and supports the occupant's back. The support structure 22 of the backrest 16 has two side portions 26 extending in the longitudinal direction. The two side portions 26 are connected to the flange 20 of the support base 12 around a transverse horizontal axis 28. The two side portions 26 of the backrest 16 are provided with transverse holes 30 that are aligned with each other and connected by trunnions (not shown) to corresponding holes 32 provided at the upper end of the flange 20 of the support base 12. Yes. Each of the two side portions 26 of the backrest 16 is provided with a connection portion 34 extending forward with respect to the joint shaft 28. The connecting portion 34 is provided with a transverse hole 36 having shafts aligned with each other at the front end thereof.

  Still referring to FIGS. 1 and 2, the sheet 14 includes a support structure 38 and a panel 40. The support structure 38 includes a cross member 42 and two longitudinal members 44 fixed to the cross member 42. Each of the two longitudinal members 44 has a longitudinal guide with which a block 46 fixed to the lower portion of the panel 40 is engaged. This arrangement allows the position of the panel 4 to be adjusted longitudinally with respect to the support structure 38. One of the two blocks 46 is provided with a restraining device that allows the panel 40 to be fixed at a preselected position and can be opened by a lever 48.

  The transverse member 42 of the seat support structure 38 is provided with two vertical arms 50 fixed to the transverse member 42 at its side edges. Each of the two arms 50 is provided with a hole 52 having a transverse axis. The vertical arm 50 of the cross member 42 is articulated to the connection 34 of the backrest 16 by two pivot pins 54 that engage the two side-by-side holes 36, 52. A pivot pin 54 provides a movable articulation about the axis indicated by 56 between the transverse member 42 of the seat support structure 38 and the back support structure 22. The joint shaft 56 is parallel to the joint shaft 28 between the backrest 16 and the support base 12 and is disposed forward.

  The seat support structure 38 is connected to the support base 12 by two swing levers 58. Each swing lever 58 has a first end connected to the support base 12 and a second end connected to the seat support structure 38. More specifically, the second end of each swing lever 58 is connected to the longitudinal member 44 of the seat support structure 38. The axis of oscillation of the oscillation lever 58 is indicated by reference numerals 60 and 62, respectively. The axes are parallel to each other and parallel to the previously described joint axes 28 and 56. In the illustrated example, two swing levers 58 are provided, but the same result can be sufficiently achieved with a single swing lever 58.

  Referring to FIGS. 2 and 5, the support base 12 supports an elastic member constituted by the flexible rod 64. The flexible bar 64 extends transversely and parallel to the joint axes 28,56. The ends of the flexible bars 64 extend laterally beyond the transverse member 42 of the sheet support structure 38. Each of the ends engages with a hole in two vertical levers 66. The upper end of the vertical lever 66 is connected to the connecting portion 34 of the backrest 16. In the illustrated embodiment, the upper end of the lever 66 is articulated to the connecting portion 34 by the pivot pin 54 described above that pivotably connects the connecting portion 34 of the seat 16 to the vertical flange 50 of the seat support structure 38. ing. The flexible rod 64 can be a metal rod having any cross section, for example, a circle, a square, or a rectangle. The flexible rod 64 may be formed as a leaf spring having a plurality of long pieces that are fixed to each other. Although the central portion of the flexible rod 64 is fixed to the support base 12, the side portion of the flexible rod 64 can be elastically deformed with respect to the fixed central portion.

  With reference to FIGS. 2 and 5, the support base 12 includes two fixed pivot pins 68 and two movable pivot pins 70. The pivot pins 68, 70 are provided with through holes having a transverse axis through which the flexible rod 64 extends. The holes of the pivot pins 68 and 70 are aligned with each other, and the movable pivot pin 70 is disposed outward in the transverse direction with respect to the fixed pivot pin 68. Each of the movable pivot pins 70 extends through the transverse slot 72 of the support base 12. The movable pivot pin 70 is movable with respect to the support base 12 by an adjustment mechanism that allows playful engagement with the flexible rod 64 and moves the pivot pin 70 together. The amount of movement of the pivot pin 70 changes the free curve length of the end of the rod 64. As a result, the movable pivot pin 70 changes the rigidity of the flexible rod 64.

  6 and 7 show examples of adjustment mechanisms that control the movement of the movable pivot pin 70. Each movable pivot pin 70 is fixed to the adjustment rod 74. The two rods 74 are disposed on the lower surface of the support base 12 and each have a rack 76 that meshes with the same gear 78 that is free to rotate about a vertical axis. One of the adjustment rods 74 is provided with an operating grip 80. If the grip 80 moves in the transverse direction, the two rods 74 move together in the direction indicated by the arrow 82 in FIGS. FIG. 6 shows the pivot pin 70 in the outermost position that makes the flexible rod 64 the stiffest. FIG. 7 shows a state in which the pivot pin 70 is in the innermost position that makes the flexible rod 64 the most flexible (lowest stiffness).

  3 and 4 show two extreme positions of the chair according to the invention. In the state shown in FIG. 3, the flexible rod 64 is in a position where it is not deformed. The backrest 16 is in the forward tilt position, and the seat 14 is in the fully lowered position. The chair appears to be in this state when it is not occupied by the user, or when the user is seated on the seat 14 but is not exerting a backward force on the backrest 16.

  FIG. 4 shows the backrest 16 in the final tilted state. The flexible bar 64 is in the most bent state, and the sheet 14 is in the fully raised position. This is the arrangement taken by the chair when the user deposits his / her weight back on the back. The backward thrust imparted to the user contrasts with the weight of the user on the seat 14 and the reaction force of the flexible bar 64.

  The connection between the seat 14 and the support base 12 is achieved by the swing lever 58 and the connecting portion 34. The connection geometry moves forward while the seat moves from the lowered position to the raised position, and at the same time changes its slope relative to the horizontal plane. This movement of the backrest makes it possible to give an ideal state from an ergonomic point of view at every position of the chair.

  The use of the flexible bar 64, which is an elastic member for returning the backrest 16 in the forward tilt position, can greatly reduce the size of the support base 12. The mechanism for adjusting the stiffness of the elastic organ is also particularly simplified by the elastic organ consisting of a flexible rod.

  As a possible variant, the end of the flexible bar can be connected to the downward extension of the vertical arm 50.

The partial perspective view of the chair concerning the present invention. The partial exploded perspective view of the chair of FIG. The longitudinal cross-sectional view in the III-III line | wire of FIG. 1 which shows one of the two positions of the chair of this invention. The longitudinal cross-sectional view in the III-III line | wire of FIG. 1 which shows the other of two positions of the chair of this invention. Partial sectional view taken along line V-V in FIG. The bottom view of the chair concerning this invention. The bottom view of the chair concerning this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Chair 12 Support base 14 Seat 16 Back 20 Flange 22 Support structure 26 Side part 28 Joint axis 34 Connection part 38 Support structure 42 Cross member 50 Vertical arm 56 Cross axis 58 Swing lever 60, 62 Cross axis 64 Flexible rod 66 Vertical axis 70 Movable pivot pin 74 Rod 76 Rack 78 Gear

Claims (7)

A support base (12);
A seat (14) including a support structure (38) movable between a lowered position and a raised position with respect to the support base (12);
A backrest (16) connected to the support base about a transverse axis (28) and having a support structure (22) swinging between a forward-most tilted position and a final-tilted position about the transverse axis;
The seat (14) and the backrest (16) have the seat in the lowered position when the backrest is in the foremost tilted position and the seat in the raised position when the backrest is in the last tilted position. Connected to each other,
The seat support structure (38) includes at least one oscillating lever (12) connected to the support base (12) and the seat support structure (38) around transverse axes (60, 62) parallel to each other. 58) connected to the support base (12),
The back support structure (22) has two sides (26) each having a connection (34) that extends beyond the joint axis (28) of the back back (16) to the support base (12). The connection (34) is connected to the seat support structure (38) about a transverse axis (56) disposed forward relative to the articulation axis (28) of the backrest (16). A chair characterized by that.   An elastic device that urges the backrest (16) toward the forward-most tilted position and urges the seat (14) toward the lowered position; and the elastic device is fixed to the support base. A chair according to claim 1, comprising a transverse flexible bar (64) having a central portion and two ends connected to the connection (34) of the backrest (16). .   The chair according to claim 2, characterized in that the flexible bar (64) is connected to the connection (34) of the backrest (16) by two vertical levers (66).   An apparatus for adjusting the stiffness of the flexible bar (64), including two movable pivot pins (70) that are aligned with each other and each have a transverse hole through which the flexible bar (64) extends. The chair according to claim 2, comprising:   The adjusting device includes two rods (74) each fixed to the movable pivot pin (70) and provided with a rack (76) that meshes with the same gear (78). The chair according to claim 4.   The support base (12) includes two side flanges (20) extending upwardly connected to the side portions (26) of the support structure (22) of the backrest (16). The chair according to claim 1.   The seat support structure (38) includes a cross member (42) comprising two side vertical arms (50) whose upper ends are articulated to the connection (34) of the backrest (16). A chair as claimed in claim 6 characterized in that:

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