JP2002010852A - Chair having seat and backrest rocking simultaneously - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chair having a seat part and a backrest rocking simultaneously. SOLUTION: This chair includes the backrest part 26 connected to a base 14 around a first cross shaft A, a seat support part 44 rocking in synchronization with rocking of the backrest part 26 to the base 14, and an elastic device 24 for applying elastic force opposite to the backward rocking of the backrest part 26 and the seat support part 44. A front part of the seat support part 44 is connected to the base 14 by a movable connecting device 50, and a rear part of the seat support part 44 is connected to the backrest part 26 to freely rotate around a second rocking cross shaft B parallel to the first cross shaft A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chair provided with a seat and a backrest that swing simultaneously, and more particularly to a base structure and a movable connection to the base structure about a first transverse axis. Backrest support structure, a seat support structure movable relative to the base structure at the same time as the swing of the backrest support structure, and an elasticity acting to oppose the backward swing of the seat and the backrest. And a chair comprising:

[0002]

2. Description of the Related Art The swing of a chair seat and a backrest must be accurately linked to achieve an ideal state of comfort (comfort) in any position of the backrest. Has been shown by studies in ergonomics. The devices (mechanisms) that make it possible to obtain the desired relevance (interrelation, correlation) with respect to the rocking of the seat and the backrest are usually complicated, expensive and cumbersome.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a chair which makes it possible to overcome the above disadvantages.

According to the present invention, the above object is achieved by a chair having the following configuration.

[0005] That is, this chair swings at the same time,
That is, a chair provided with a seat and a backrest that swings in synchronization with each other.
A backrest support structure movably connected about a transverse axis, a seat support structure swinging simultaneously with the swing of the backrest support structure with respect to the base structure, and a back swing of the seat and the backrest. Resilient means acting to oppose the back support structure, wherein the rear of the seat support structure is movably connected to the back support structure about a swinging second transverse axis parallel to the first transverse axis. The front portion of the seat support structure is connected to the base structure by at least one movable connection member.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A chair according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIGS. 1A and 1B, reference numeral 10 indicates a chair having the following configuration. That is, the chair 10 is provided with a central support portion 12 (which is a well-known type in itself) whose height can be freely adjusted, and a central support portion 12 for supporting a base structure portion 14 at an upper portion. ing. This base structure 14
Supports the seat 16, the backrest 18, and the armrest 20.

Referring to FIGS. 2 to 5, the base structure 14 has a substantially box shape, is open at the top, and is fixed to the upper end of the central support 12. A transverse tubular member 22 is fixed to the base structure 14 and supports a torsion bar 24 inside the transverse tubular member 22. The torsion bar 24 is formed of, for example, a thin, narrow metal sheet of one pack.

The backrest 18 has a support mechanism having the following configuration. That is, the support mechanism includes two tubular members 26 having a predetermined shape, and a lower end portion of the tubular member 26 is movably connected to the lateral tubular member 22 about the first lateral axis A. I have. The tubular member 26 constituting the backrest support structure is fixed to both ends of the torsion bar 24. Each armrest 20 has a vertical section 3
0 supported. The vertical portion 30 is adjustable in height and fixed at its lower end to the corresponding end of the tubular member 26 of the backrest support structure.
Thus, as shown in FIGS. 1A and 1B, the armrest 20 can swing integrally with the backrest about the horizontal axis A.

Referring to FIGS. 3, 6 and 7, the central area of the torsion bar 24 is fixed to an adjustment lever 32. This fixing is performed by, for example, the torsion bar 2
4 and a correspondingly shaped hole formed in the adjustment lever 32. As shown in FIGS. 6 and 7, one end of the adjustment lever 32 is connected to the base structure 14 by means of an adjustment device 34. The adjusting device 34 can change the pre-loading of the torsion bar 24. The adjusting device 34 includes an adjusting knob 38.
And a screw 36 fixed thereto. This screw 36 engages with the inner screw 40. This inner screw 40
Cooperates with the upper part of the pressure member 42. This pressure member 42
Is located on one end of the adjustment lever 32. The pressure member 42 is formed so as to fit in shape with the adjustment lever 32, whereby the pressure member 4
2 is prevented from rotating about the axis of the screw 36. By rotating the adjustment knob 38, the angular position of the adjustment lever 32 with respect to the base structure 14 can be changed.

As shown in FIG. 6 and FIG.
Changes the position of the torsion bar 24, thereby acting on the backrest that swings the backrest around the horizontal axis A backward by overcoming the force of the spring, that is, the elastic (elastic) preloading of the torsion bar 24. Power is changed.

Referring to FIGS. 2 to 5, the chair 10 includes a seat support structure 44. The seat support structure 44 has a substantially box shape and is open at the bottom. A seat 16 having a corresponding pad is fixed on the seat support structure 44. As shown in FIG. 3, the two tubular members 26 forming the backrest support structure are connected to each other by a lateral rod 46 parallel to the first lateral axis A. The seat support structure portion 44 is movably connected around a rod 46 at a rear portion thereof. As shown in FIG. 3, this connection is realized, for example, by means of a pair of bushes 48. These bushes 48 are supported by both side walls of the seat support structure 44, and are rotatably engaged with the rod 46.

The seat support structure 44 thus rests about an axis B (see FIG. 3) parallel to the movable connection axis A located between the back support structure 26 and the base structure 14. It is connected to the support structure 26.

The front of the seat support structure 44 is movably connected to the base structure 14 by means of a pair of connecting rods 50. Each connecting rod 50 has a lower end connected to the base structure 14 about a shaft 52 and an upper end connected to the seat support structure 44 about a shaft 54. The connecting shafts 52 and 54 are parallel to the axes A and B.

From the viewpoint of dynamics, the seat support structure 44 is provided with a quadrilateral joint device (a quadrilateral movable connecting mechanism, articu
It is connected to the base structure 14 by means of a lated-quadrilateral mechanism. This quadrilateral (quadri
lateral) is formed by the lines connecting axes A and B and 52 and 54, respectively.

As long as the seat support structure 44 is connected to the back support structure 26, and as long as the seat support structure 44 is forced to follow the latter swing, the backrest and the seat Rocking always
It will be appreciated that they are closely related.

The seat 10 is further provided with a blocking device for blocking the seat and the backrest at a plurality of different positions. Referring to FIGS. 3, 4, and 5, the blocking device includes a rocker arm 56 having a central portion connected to the transverse tubular member 22 about axis A; It has a first end connected to the transverse rod 46 about the axis B and a second end having a plurality of holes 58,60. The plurality of holes 58, 60 can be engaged by each blocking member.

The rocker arm 56 is preferably provided with a pair of insertion members 62 and 64. As shown in FIGS. 4 and 5, the insertion members 62 and 64 come into contact with the base structure portion 14, whereby the maximum forward tilt position (see FIG. 4) and the maximum backward tilt position (see FIG. 5). ) Is determined. Referring to FIGS. 8 to 12, the chair 10 includes a control device 66. The control device 66 blocks the seat and the backrest from simultaneously swinging (blocking, blocking, stopping).
It can be manually operated to release and release. The control device 66 includes a support 68 fixed to the base structure 14 of the chair A. The control shaft 70 is supported by the support portion 68 so as to swing about its own axis. This control shaft 7
0 is swingable between the blocking position and the release position. The control shaft 70 supports a control lever 71 that can be manually operated at one end.

The transverse pin 72, which is fixed to the control shaft 70, has a head 74 projecting from a support 68. This lateral pin 72
An acquisition device (arre) configured to define two holding positions corresponding to the blocking position and the release position.
(st mechanism) 76. In the illustrated embodiment, the capture device 76 includes a first capture member 78 and a second capture member 80. Each of the first capturing member 78 and the second capturing member 80 is a semicircular seat (seat) provided so as to face each other, and the pins 72 are provided between them so as to perform a holding operation.
Has a semicircular sheet configured to grip a part of the sheet.

The two capturing members 78 and 80 are slidable along the axis of the control shaft 70 with respect to each other, and the capturing members 78 and 80 are, for example, spirals in a compressed state. The elastic members constituted by the springs 84 elastically press (bias) each other.

By exerting a torque larger than the initial value on the axis of the control shaft 70 by means of the control lever 71, a snap action (snap action) causes the pin to move from one of the two operating positions shown in FIGS. 72 can be moved.

The control device 66 has a pair of blocking pins 86 and 88. These blocking pins 8
6 and 88 are slidable in each seat (seat) 90 integrated with the base structure 14. As shown in FIGS. 9 and 10, these blocking pins 86, 88
In the direction orthogonal to the rocker arm 56, the arm is slidable between a release position shown in FIG. 9 and a block position shown in FIG.

The control device 66 includes a pair of pin springs 9.
2 is provided. Each pin spring 92 includes a first arm 94 that engages with the head 74 of the pin 72, and a second arm 96 that engages with the radially additional member of each of the blocking pins 86 and 88. Each pin spring 92 has a central portion supported by a pin 100 so that it can rotate. This pin 100 is
Is integrated with the support portion 68.

As can be understood by comparing FIGS. 9 and 10, the movement of the pin 72 from the release position to the block position causes the spring 92 to move from the release position (see FIG. 9) to the block position (see FIG. 10). ) Is controlled.

In the operation state shown in FIG.
Controls the blocking pins 86 and 88 to a retracted position in which they do not operate. In this operation state, the rocker arm 56 can freely rotate around the axis A.
The backrest and the seat are pressed by the torsion spring 24 in the direction of the position shown in FIG. Then, the backrest and the seat can be freely swung rearward (that is, to incline rearward) under the action of a push applied by the user to the rear.

In order to block the seat and the backrest in a general position where the seat and the backrest are inclined backward, the user sets the seat and the backrest at a desired position, and controls the control lever 7.
1 is rotated in the direction of the block position. This lever 71
The pin 72 is turned (converted, shifted) in the direction of the block position shown in FIG. In this operation state, the blocking pins 86 and 88 are
Is pressed in the direction of the rocker arm 56. As soon as the holes 58, 60 are located in positions corresponding to the pins 86, 88, the pins are pressed into the holes by the respective springs 92 so that they engage the holes.

In the blocking position, the rocker arm 56 is integral with the base structure 14, as shown in FIG. At this time, the blocking pins 86, 88
Are engaged with the corresponding holes 58, 60,
The rocker arm 56 is prevented from rotating about the axis A.

The rocker arm 56 is blocked, thereby preventing the seat and the backrest from swinging. Also, each hole 58, 60 defines a different block position for the seat and the backrest.

As shown in FIG. 3, this chair also has
A second lever 102 is provided. This second lever 1
02 can be manually operated, in a manner known per se, to control a gas-operated spring that controls the height adjustment of the chair.

[Brief description of the drawings]

FIGS. 1 (a) and 1 (b) are side views of a chair according to the present invention, showing two operating states.

FIG. 2 is a partial perspective view of a chair mechanism (mechanism, device) indicated by an arrow II in FIGS. 1 (a) and 1 (b).

FIG. 3 is a sectional view taken along line III-III of FIG. 2;

4 is a sectional view taken along the line IV-IV in FIG. 3, showing one operation position.

FIG. 5 is a sectional view taken along line IV-IV in FIG. 3, showing another operation position.

FIG. 6 is a sectional view taken along the line VI-VI in FIG. 3, showing one operation position.

FIG. 7 is a sectional view taken along line VI-VI in FIG. 3, showing another operation position.

8 is a perspective view of the control device indicated by an arrow VIII in FIG.

9 is a sectional view taken along line IX-IX of FIG. 8, showing the control device in a release position.

FIG. 10 is a sectional view taken along line IX-IX of FIG. 8, showing the control device at a block position.

11 is a sectional view taken along line XI-XI in FIG.

12 is a sectional view taken along line XII-XII of FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Chair 12 Central support part 14 Base structure part 16 Seat 18 Backrest 20 Armrest 22 Lateral tubular member 24 Torsion bar 26 Tubular member 30 Vertical part 32 Adjustment lever 34 Adjuster 36 Screw 38 Adjustment knob 40 Inner screw 42 Pressure member 44 Seat support Structure part 46 Lateral rod 48 Bush 50 Connecting rod 52 Shaft 54 Shaft 56 Rocker arm 58 Hole 60 Hole 62 Insertion member 64 Insertion member 66 Control device 68 Supporting portion 70 Control shaft 71 Control lever 72 Horizontal pin 74 Head 76 Capture device 78 First capturing member 80 Second capturing member 84 Spiral spring 86 Blocking pin 88 Blocking pin 90 Seat (seat) 92 Pin spring 94 First arm 96 Second arm 98 Additional member 100 Pin 102 Second lens Bar A axis B axis

Claims (12)

[Claims] 1. A chair comprising a seat and a backrest which simultaneously swing, comprising a base structure (14) and a movable connection to the base structure (14) about a first transverse axis (A). The backrest support structure (26) and the backrest support structure (2) with respect to the base structure (14).
6) The sheet support structure (44) which swings simultaneously with the swing.
And elastic means (24) acting to oppose rearward swinging of the seat and the backrest, the rear of the seat support structure (44) being parallel to the first transverse axis (A). The pivoting second transverse axis (B) is centered and movably connected to the backrest support structure (26), and the front of the seat support structure (44) is connected by at least one movable connection member (50). Chair connected to the base structure (14). 2. The backrest support structure (26) is provided so as to be swingable about a horizontal tubular member (22) supported by the base structure (14), and the backrest support structure (26). 26) is a torsion bar (24) provided inside the lateral tubular member (22).
The chair according to claim 1, wherein the chair is fixed to an outer end of the chair. 3. The back support structure (26) comprises a pair of side tubular members (26) provided at opposite ends of the lateral tubular member (22).
The described chair. 4. The pair of side tubular members (26) are connected to each other by a transverse rod (46) forming the second transverse axis (B). Chair. 5. The chair according to claim 1, wherein the seat support structure (44) is connected to the base structure (14) by means of a quadrilateral joint mechanism. 6. The seat support structure (44) wherein the front portion is movably connected to the base structure (14) by means of a pair of connecting rods (50). The chair according to 5. 7. The torsion bar (24) cooperates with an adjusting device (32), the adjusting device (32) comprising a lever (32) fixed to the center of the torsion bar (24), 3. The chair according to claim 2, further comprising a screw device (36, 38) adapted to adjust the position of the lever (32) with respect to the base structure (14). 8. The chair according to claim 1, further comprising a block device (55, 66) for restraining the seat and the backrest in at least one selected position. 9. The block device (55, 66) is a lever movably connected to the base structure (14) about the first horizontal axis (A), and the back support structure (9). 26) has a lever (56) movably connected about the second horizontal axis (B), and the lever (56) is at least movable between a release non-operation position and a block operation position. 9. The chair according to claim 8, wherein the chair cooperates with a control device including one blocking member. 10. The control device (66) is a pair of blocking pins (86, 88) slidable in a direction perpendicular to a plane on which the lever (56) swings, and includes a lever (56). ), And the holes (58,
60) cooperating with a pair of blocking pins (86, 8).
10. The chair according to claim 9, further comprising (8). 11. The control device (66) includes a lateral pin (7) for controlling the sliding of the blocking pins (86, 88) by means of a pair of pin springs (92).
The chair according to claim 10, characterized in that it comprises a rocking shaft (70) for supporting 2). 12. The control device (66) further comprising a holding device (76) configured to hold the swing shaft (70) in a blocking position and a release position, respectively. The chair according to 11.