JP2003230449A - Chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the freedom of design of an operation part for inducing the movement of a backrest or a seat. <P>SOLUTION: This chair comprises the operation part 54 and a support part 5 for movably supporting the operation part 54, so that the movement of the backrest or seat is induced by the movement of the operation part 54. Slide engagement parts for slidably engaging the operation part 54 with the support part 5 are provided in a plurality of positions, so that the operation part 54 performs at least a movement including a posture change to the support part 5 by the sliding effect in each slide engagement part. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chair that can contribute to improving sitting comfort.

[0002]

2. Description of the Related Art Conventionally, various ideas have been made for chairs used in offices or the like for the purpose of improving the sitting comfort. Recently, multifunctional chairs having various mechanisms such as a locking mechanism, a backrest tilt mechanism, a seat lifting mechanism, and a seat forward / backward sliding mechanism have been developed.

[0003]

However, such a multifunctional chair has disadvantages not only in terms of cost, but also in internal structure becoming complicated and designing due to interference between members. Problems such as a reduction in the degree of freedom may occur. For example, when trying to rotationally move a backrest or a seat, a rotation axis is usually indispensable, but the position of the rotation axis is uniquely determined from the movement required for the backrest or the seat. However, if a situation occurs in which the rotary shaft interferes with another member, the other member must be changed to another part, and a new mechanism for that is required. Can happen. And, due to the new mechanism, the price may rise and another trouble may occur.

Therefore, the present invention reasonably avoids the above-mentioned problems such as interference of members and increase in cost with a uniform and simple structure when the backrest and the movement of the seat are desired. The purpose of the chair is to provide an extremely suitable structure for a chair that is becoming more functional.

[0005]

In order to solve the above-mentioned problems, the present invention comprises an operating part and a support part for movably supporting the operating part, and the backrest or seat is supported by the movement of the operating part. In the chair adapted to cause the movement of the slide, the slide engaging portions for slidably engaging the operating portion and the supporting portion are provided at a plurality of positions, and the operating portion is slid by the slide engaging portions. Is configured to make a movement including at least a posture change with respect to the support portion. "Movement" here means an operation involving at least one of rotational movement and position movement, and "movement" means an operation involving at least one of "movement" and deformation. is there.

In such a case, the slide engaging portions formed at a plurality of points constitute a supporting point for movement including a posture change. Therefore, the setting of the slide engagement portion when implementing a certain specific operation can be configured in various ways, which leads to an increase in the degree of freedom in the design of the supporting portion. In particular, it is extremely desirable that a chair having a high function and a complicated structure has a high degree of freedom in design, in order to prevent interference between members and to make the chair compact. In addition, it becomes easy to make the motion part perform various movements.

As a concrete configuration example of the chair according to the present invention, the slide engaging portion is provided at two places, and the first slide engaging portion is set on the operating portion side. A first shaft and a first shaft provided on the side of the supporting part so that the first shaft can slide along a predetermined line and the operating part can rotate about the first shaft. A second slide engaging portion is provided on the operating portion side and a second shaft set on the supporting portion side at a position displaced from the predetermined line. The second slide guide is slidably engaged with a second slide guide that guides the operation unit so as to be rotatable about the second shaft. By driving the shaft of the shaft toward or away from the second shaft, Mention may be made of those work unit is to perform a movement including an attitude change with respect to the support portion. “Setting” the axis means that the axis is provided in such a manner that the relative position between the object and the axis does not change, and is a concept that includes the one provided by the bearing and the one provided by fixing the axis. It is convenient for the slide guide portion to be a long hole.

In order to make the chair more convenient for the seated person, it is preferable to move the operation part by operating the operation part so that the operation part can be fixed at a desired position. Furthermore, if a part or all of the backrest surface that should support the back of the seated person is deformed by the movement of the motion part, it is possible to significantly affect the usability of the seated person. . For example, the backrest surface is formed on an elastically deformable backrest body, and by moving at least one of the lower end portion or the upper end portion of the backrest body by the operating portion, the backrest surface is formed. It can be configured to be deformed.

By moving the motion part, the lumbar part corresponding surface of the backrest surface, which substantially corresponds to the lumbar part of the seated person, is allowed to move including at least one of the front-back direction and the up-down direction component. The comfort can be further improved. The backrest upper support portion in which the support portion is set to the back frame, the backrest main body is supported by the operating portion on the lower side, and the upper side thereof is set above the support portion setting portion of the back frame. If it is supported by, the operating part pushes up the lower part of the backrest body, and the upper part of the backrest body tilts backward. Even if the rear portion of the seat surface is configured to move including the vertical component by the movement of the operation portion, the occupant's feeling of use can be enhanced.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below. The chair C according to the present embodiment is shown in FIGS.
As shown in FIG. 1, the chair body 1 forming a base as a structure has a leg 2 and a support base 3 attached to the upper end side of the leg 2.
And a back frame 5 having a front end supported by the support base 3, and a back frame 5 having a base end attached to the support base 3 and a rear part of the seat support 4 supported at an intermediate portion. A seat 6 and a backrest 7 are attached to the seat support 4 and the back frame 5 of the chair body 1, respectively.

The leg 2 has a structure in which a column 22 is erected from the center of five leg blades 21. The column 22 can move up and down and a gas spring mechanism (not shown) is incorporated inside.

The support base 3 is rotatably attached to the upper end of the column 22, and as shown in FIG. 3, the support base 3 extends horizontally forward and has a bottom formed by partially penetrating the column 22 in the vertical direction. The wall 31, a front wall 32 that rises obliquely forward from the front end of the bottom wall 31, and stands up from the periphery of the bottom wall 31 and the front wall 32 and rises inward together with the bottom wall 31 and the front wall 32. A substantially boat shape is formed by the side wall 33 forming the opening for storing the mechanism portion. This support base 3 is
The front seat receiving attachment shaft 34 can be integrally projected or externally attached to the front portion of the side wall 33 with their axes aligned in the direction facing back. Further, the support base 3 has a spine mounting shaft 35 penetrating between the left and right side walls 33 at a position crossing above the bottom wall thereof.

The seat support 4 is shown in plan view in FIG.
As shown in FIG. 5 which is a perspective view of a state in which the vertical frames 41 are mounted on the support base 3, the vertical frames 41 extend in parallel in the front-rear direction at regular intervals, and between the front-end vicinity portions of the vertical frames 41 and the rear portion. The horizontal frame 42 is provided at a position where the end-neighboring portions are connected to each other, and has a substantially cross beam shape. In the vicinity of the front end of each vertical frame 41, there is an elongated hole 4 extending in the front-back direction.
11 are provided in association with each other, and the end of the front seat receiving attachment shaft 34 of the support base 3 is slidably inserted into each elongated hole 411 along the elongated hole 411.

As shown in FIGS. 2 and 3, the back frame 5 includes a pair of back frame elements 51 which are bent in a substantially L shape.
And a connecting member 52 for connecting the upper end vicinity portions of these back frame elements 51 with a constant gap therebetween, and between the pair of back frame elements 51, the back frame 5 is provided.
3 between the base end 51a and the bent portion 51b of FIG.
The rear seat mounting shaft 53 shown in FIG. And the base end 5 of each spine frame element 51
1a is rotatably attached to the back mounting shaft 35 of the support base 3, and is mounted between the back frame elements 51 to form a rear seat receiving mounting shaft 5
The rear portion of the vertical frame 41 of the seat bridge 4 is attached to 3.

With the above configuration, as shown in FIG.
In this chair body 1, the front seat receiving attachment shaft 34 of the support base 3 is positioned at the rear end side of the long hole 411 of the seat receiving member 4 and the back frame 5 is raised to give the chair C a normal use posture in the state shown by the solid line in the figure. , The front seat receiving mounting shaft 34 of the support base 3 is seated 4
The seat frame 4 is positioned at the front end side of the long hole 411 and the back frame 5 is tilted backward, and the rear end of the seat support 4 is depressed to give the chair C a resting posture. It will be realized.

In the chair body 1, a reaction force mechanism H is incorporated in a part of the synchro tilt mechanism to form a locking device L, and a locking fixing mechanism E for fixing the locking at a predetermined position and a rocking hardness. A reaction force adjusting mechanism A for adjusting the above is added as a component of the locking device L.

As shown in FIGS. 3 and 5, the reaction force mechanism H is tilted backward (approximately 45) into the mechanism accommodating space of the support base 3.
A pair of coil springs S whose upper front ends are supported by a fixed retainer H1 and a first rotating arm H2 which is on the back mounting shaft 35 and rotates in synchronization with the tilting motion of the back frame 5. A movable retainer H3 mounted around the shaft at a position displaced from the spin mounting shaft center of the first rotating arm H2.
And a rear lower end of the coil spring S is supported by the movable retainer H3, and the movable retainer H3 is moved through the first rotation arm H2 in accordance with the backward tilting operation of the back frame 5.
Has a structure for compressing the coil spring S. Note that, in FIG. 5, the first rotating arm H2 and the like between the pair of coil springs S are omitted.

As shown in a plan view of the locking position fixing mechanism E in FIG. 4 and a perspective view of the locking position fixing mechanism E attached to the seat bridge 4, as shown in FIG. A pair of fan-shaped lock plates E1 rotatably attached about the vertical axis X1, a motion conversion mechanism E2 for converting the locking motion of the back frame 5 into the synchronous rotary motion of the pair of lock plates E1, and a lock plate. The operation unit E3 selectively fixes E1 to each other. The lock plate E1 has a first vertical axis X1.
A radial cross section passing through is a downward L shape, and holes E1b opening in the radial direction are formed at a plurality of positions in the circumferential direction at a predetermined pitch on a cylindrical surface E1a that is a set of hanging parts on the circumference. The holes E are provided along with the synchronous rotation operation.
1b successively arrives on a virtual straight line L1 connecting the axial centers of both the first vertical axes X1 and closely faces each other. The motion converting mechanism E2 has one end connected to the base end of the fan-shaped lock plate E1 via the engaging portion X2 of the second vertical shaft and the horizontal elongated hole, and the other end connected to the front seat mounting shaft of the support base 3. The lock plate E1 is mounted on the seat support 4 when the seat support 4 is moved rearward and downward with respect to the support base 3 in accordance with the rocking operation.
While the first vertical axis X1 for axial support follows, the second vertical axis X2 engaged with the base end of the lock plate E1 has the connecting member E.
Since it is held in a fixed position by the support base 3 via 21, when the seat support 4 sinks due to locking as a result, the cylindrical surface E1a of the fan-shaped lock plate E1 is pushed by the first vertical axis X1 and the engagement is performed. It is adapted to turn backward around the joint portion X2. The operation portion E3 rotates the lock pin E31 which is arranged so that its axis coincides with the imaginary straight line L1 and can move back and forth in the coaxial center direction, and its base end rotates to the horizontal frame 42 of the seat 4 via the third vertical axis X3. A second rotary arm E32, which is attached to the lock pin E31 via an engagement portion X2 of a horizontally elongated hole and a vertical pin, which is movably attached, and the second rotary arm E32 is provided in the holes E1b of the lock plates E1. The spring element E4 that presses in the passing direction and this second
A locking position adjusting lever E5 for performing an operation of pulling back the rotary arm E32 against the spring element E4 and pulling out the lock pin E31 from the holes E1b of the both lock plates E1.
The rocking position adjusting operation lever E5 is attached to the side of the seat support 4 at an appropriate position. The spring element E4 and the locking position adjusting operation lever E5 are
They are connected by a wire E6 shown in FIG.

The advantage of the locking position fixing mechanism E is that the outer periphery of the lock plate E1 is swung more greatly in association with the movement of the seat support 4, and the hole E1b of the lock plate E1 and the lock pin E31 are engaged in this outer periphery. The lock plates E1 are fixed to each other by the fitting, and the movement of the seat support 4 is stopped to fix the back seat at the locking position. Therefore, even if the distance between the holes E1b of the lock plate E1 is relatively large, the back seat is locked and locked. Can be performed in relatively small steps, the hole E1b of the lock plate E1 and the lock pin E31 from the first vertical axis X1.
Since the torque arm up to the engagement portion with is larger than the torque arm up to the engagement portion X2 between the first vertical axis X1 and the lock plate E1 and the connecting member E21, the force required for locking can be reduced. , Lock pin E31
The mechanism necessary for fixing can be simplified by providing rigidity to the lock plate E1 and the lock plate E1. In order to lock the backrest 7 by locking the pair of lock plates E1 to each other, the connecting member E21 In addition, it is possible to mount all the component parts such as the operation unit other than the operation unit on the side of the seat support 4 and to always arrange the operation unit at a constant relative position with respect to the movement of the seat 6. When the seated person separates from the chair in the locking state and tries to move in the direction in which the back seat is raised by the reaction force mechanism H, according to the structure of the present embodiment, the lock pin E31 is in the shearing direction from the hole E1b of the lock plate E1. Therefore, the lock pin E31 is prevented from coming off from the hole E1b by the frictional force.
It is possible to prevent the back seat from being suddenly raised even when standing up from the chair, and to sit down again so that the force in the shearing direction disappears and the unlocking operation can be performed again. Also, a fan-shaped lock plate E
Since 1 rotates only in a horizontal plane, it is possible to design thinly, and by forming teeth that mesh with each other on the outer peripheral portion of the fan-shaped lock plate E1, it is possible to eliminate a deviation in operation. Can be mentioned.

As shown in FIG. 3, the reaction force adjusting mechanism A is constructed such that the fixed retainer H1 of the coil spring S is actually held at the fixed position by the axial backup member A10. This backup member A
A third rotary arm A1 that includes 10 as a part and is rotatable about a horizontal axis A11 is screwed in a position that is displaced from the horizontal axis A11 of the third rotary arm A1 in a direction substantially orthogonal to the displacement direction. And a screw element A2 having a grip A21.
Penetrates through the front wall 32 of the support base 3 and projects to the outside of the front wall 32, and the grip A21 is arranged at the projecting position. Then, when a screw feed operation is given to the screw element A21 through the grip operation, the third rotation arm A1 moves to the horizontal axis A1.
Rotate around 11 to move the backup position of the retainer H1 through the backup member A10 to the coil spring S.
It is possible to move in the direction of increasing or decreasing the compression force of. In addition, since the intersection angle of the third rotation arm A1 and the screw element A2 changes according to the operation position, the screw element A2
Attach the pressing plate A22 to the tip of the
1 is formed with a partial arcuate projection A12, and the projection A
By pressing 12 with the pressing plate A22, it is possible to cope with a change in the intersection angle.

The advantage of this reaction force adjusting mechanism A is that it can be incorporated within the longitudinal dimension of the coil spring S, so that the reaction force adjusting mechanism can be compared with the case where the reaction force adjusting mechanism is introduced at one end of the coil spring S. Since the coil spring S can be made compact in the axial direction including H, since the coil spring S is arranged in a rearwardly inclined posture (inclination of about 45 degrees in this embodiment), the coil spring S is accommodated. In this way, it is possible to effectively avoid interference between the seat 6 and the support base 3 when sliding the seat back and forth, and to secure a sufficient motion allowance. However, the operating grip A21 can be arranged on the front wall of the support base 3 that is easy to operate, and can be lightly operated by the action of the "lever" based on the arm length of the third rotating arm A1.

A chair C is completed by attaching the seat 6 and the backrest 7 to the chair body 1 as described above. In this embodiment, the backrest 7 is configured as follows and attached to the back frame 5.

That is, as shown in FIG. 6, the backrest 7 has a bag-like shape for accommodating the core material 71a made of an elastic material having a square-shape forming the outer shape of the backrest 7 and the core material 71a. A backrest main body 71 composed of a stretched cloth 71b sewn on
The backrest upper reinforcing member 72 is formed on the back surface of the upper portion of the backrest main body 71 and has a downward U-shape and is made of a rigid material. Backrest body 7
1 is formed to be elastically deformable. More specifically, the core material 71a is slightly bent in a side view "V" shape so that a portion functioning as a lumbar support portion 71x is located at a position slightly lower than an intermediate portion in the up-down direction and protrudes forward. It is molded. It goes without saying that the front surface of the backrest main body 71 is used as a backrest surface for supporting the back of the seated person. Then, in the upper part of the backrest 7, the upholstery cloth 72b
The upper backrest main body 71 and the upper backrest reinforcement member 72 are housed together.

On the other hand, on the back frame 5 side, as shown in FIG. 7, the back frame element 51 has a backrest upper support portion 51.
1 is formed. The backrest upper support portion 511 is provided with a pin insertion hole, and the pin insertion hole is overlapped with the pin insertion hole provided at the lower end of the backrest upper reinforcing member 72 to insert the horizontal pin 721. The leaning upper reinforcing member 72 is rotatably connected about the horizontal pin 721.

In addition, a lower backrest support member 54 to which the lower portion of the backrest 7, that is, the lower end of the backrest main body 71 is to be attached.
Is provided in the vicinity of the bent portion 51b of the back frame 51. More specifically, the backrest lower support member 54 includes the base 541.
And a backrest lower setting portion 54 extending upward from the base body 541.
2, and the lower end of the backrest main body 71 is attached to the backrest lower setting portion 542. In the example shown,
A backrest lower setting portion 542 is provided at the rear end of a plate-shaped base body 541 having a width dimension that can be arranged between the pair of backframe elements 51, and the backrest lower support member 54 is a side surface. It looks like a "ku". The backrest lower setting portion 542 and the lower end portion of the backrest main body 71 are coupled to each other, for example, by applying the back surface of the lower end portion of the backrest main body 71 to the front surface of the backrest lower setting portion 542 and fixing it using a pin or the like not shown. By doing. In addition, a seating surface rear mounting portion 541a on which the rear end portion of the seat 6 is mounted is set on the upper surface of the base 541. Incidentally, the engaging hole 541 existing on the upper surface of the base 541.
b can be used to fix the rear end portion of the seat 6.

Further, in this embodiment, slide engaging portions 81 and 82 for slidably engaging the backrest lower support member 54 and the back frame 51 are provided at a plurality of positions displaced from each other in a side view, and the respective slide engagements are performed. The backrest support member 54 is configured to move with respect to the back frame 5 at least including a posture change by the sliding action of the portions 81 and 82.

More specifically, the first slide engaging portion 81
Is a first shaft 811 provided on the backrest lower support member 54 side.
And so that the first shaft 811 provided on the back frame 5 side can slide along the predetermined line L1 and the backrest lower support member 54 can rotate about the first shaft 811. The first slide guide 511 for guiding is engaged with each other. More specifically, a bearing 543 is provided on the lower front of the base 541 of the backrest lower support member 54, and the first shaft 811 is rotatably inserted in the bearing 543. The pair of left and right back frame elements 51 has a first slide guide portion 5
Eleven elongated holes are formed symmetrically, both ends of the first shaft 811 are inserted into the elongated holes 511, and the first shaft 811 is the chair C.
The pair of back frames 5 are supported in parallel to the left-right direction of. As a result, the first shaft 811 and the backrest lower support member 54 can slide and move according to the side view shape of the elongated hole 511. The predetermined line L1 which is the locus of the sliding movement of the first shaft 811 is the longitudinal center line of the elongated hole 511. In the illustrated example, the predetermined line L1 is a straight line that is substantially parallel to the extension direction of the back frame 5 member, but it does not prevent the predetermined line L1 from being an arc, an elliptic arc, or other non-linear shape.

The second slide engaging portion 82 is provided on the back frame 5 side and the second shaft 821 set at a position displaced from the predetermined line L1 and on the backrest lower support member 54 side. The second shaft 821 is slidably engaged with a second slide guide portion 544 that guides the backrest lower support member 54 so as to be rotatable around the second shaft 821. In the illustrated example, bearings 512 are symmetrically provided on the pair of left and right back frame elements 51 at positions displaced upward (or forward) from the predetermined line L1 so that the second shaft 821 is inserted and the backrest is lowered. Support member 5
An elongated hole into which the second shaft 821 can be inserted is formed in the lower rear part of the base body 541 of No. 4 to form a second slide guide portion 544.
As described above, the first shaft 811 is arranged in the front and the second shaft 821 is arranged in the rear.

Further, the sliding direction of the first slide engaging portion 81 and the sliding direction of the second slide engaging portion 82 are not parallel to each other. In the present embodiment, when the back frame 5 and the backrest supporting member 54 are combined via the first shaft 811 and the second shaft 821, the first slide guide portion 511 and the second slide guide portion 544. Set so that and are non-parallel in side view.

With such a structure, as shown in FIG. 8, the backrest lower support member 54 is moved to the back frame 5 by driving the first shaft 811 and the second shaft 821 toward or away from each other.
A movement including a posture change is performed. Figure 8
In the state shown in (A), that is, when the first shaft 811 is at the front end of the movable range based on the first slide guide portion 511,
The second shaft 821 is at the rear end of the movable range based on the second slide guide 544, and the forward tilt angle of the backrest lower support member 54 with respect to the back frame 5 is minimized. First
The shaft 811 of the first slide guide 511 (or
When sliding backward and upward with respect to the predetermined line L1),
The second shaft 821 slides forward and downward relative to the second slide guide 544. At this time, the moving directions of the first shaft 811 and the second shaft 821 are not parallel,
The longitudinal centerline of the first slide guide 511 (predetermined line L
Since the longitudinal center line L2 of the elongated hole which is the second slide guide portion 544 (sliding direction based on the second slide guide portion 544) is closer to the vertical with respect to the horizontal plane than 1), it is supported under the backrest. The member 54 slides upward and rearward while rotating forward relative to the back frame 5. As a result, both the backrest lower setting portion 542 and the seating surface rear mounting portion 541a slide rearward and upward while rotating forward relative to the back frame 5. Figure 8
In the state shown in (B), that is, when the first shaft 811 is at the rear end of the movable range based on the first slide guide portion 511,
The second shaft 821 is at the front end of the movable range based on the second slide guide portion 544, and the forward inclination angle of the backrest lower support member 54 with respect to the back frame 5 is maximized. On the contrary, as the first shaft 811 slides forward and downward relative to the first slide guide portion 511, the second shaft 821 relatively moves with respect to the second slide guide portion 544. It slides rearward and upward, and therefore the backrest lower support member 5
4 slides forward and downward while rotating backward relative to the back frame 5. As a result, the backrest lower setting part 5
Both 42 and the seating surface rear mounting portion 541a rotate rearward relative to the back frame 5 and slide forward and downward.

That is, the backrest lower support member 54 can rotate relative to the back frame 5 about the first shaft 811, but the second shaft 821 and the second slide guide portion 544 are provided. Due to the existence of the relationship between the backrest lower support member 54 and the back frame 5, the relative position and posture of the backrest lower support member 54 according to the displacement amount of the first slide engagement portion 81 of the first shaft 811. Uniquely determined. Paradoxically, the backrest lower support member 54 can rotate relative to the back frame 5 about the second shaft 821.
Due to the presence of the engagement between the shaft 811 of the backrest and the first slide guide portion 511, the back frame 5 of the backrest lower support member 54 is
The relative position and posture with respect to the first shaft 811, depending on the displacement amount of the first slide engaging portion 81 or the second shaft 821 according to the displacement amount of the second slide engaging portion 82. , After all, it is uniquely determined. in this way,
The backrest lower support member 54 performs a moving operation that combines position movement and rotation movement with respect to the back frame 5.

As described above, the upper end of the backrest main body 71 is attached to the backrest upper support portion through the backrest upper reinforcing member 72, and the lower end of the backrest main body 71 is the backrest lower setting portion 542. It is attached to the backrest lower support member 54 via the front surface. Therefore, as the lower end of the backrest main body 71 moves including the posture change according to the displacement amount of the sliding movement of the first shaft 811, the backrest 7 is moved as shown in FIG.
Is a pin 511 which is the horizontal axis of the backrest upper support 511.
While rotating around a, the lumbar support part 7
1x can be projected and retracted in the front-back and up-down directions. In addition, in this embodiment, since the rear end portion of the seat 6 is mounted on the seating surface rear mounting portion 541a of the backrest lower support member 54, the displacement amount of the sliding movement of the first shaft 811. Accordingly, the seat surface of the seat 6 slides back and forth, and the rear part of the seat 6 moves including the vertical component. That is, when the backrest lower support member 54 rotates forward relative to the back frame 5 and slides upward, the lumbar support portion 71x projects and the seat 6 slides rearward, and the rear portion thereof moves downward. Move forward and upward. On the contrary, when the backrest lower support member 54 slides downward while rotating backward relative to the back frame 5,
The lumbar support portion 71x is retracted, and the rear portion of the seat surface moves rearward and downward while the seat 6 slides forward. Such an operation greatly enhances the occupant's feeling of use. Incidentally, the long hole 43 provided on the seat support 4 functions when the seat 6 is slid in the front-back direction on the seat support 4 in accordance with the operation of the lumbar.

As described above, by driving the first shaft 811 toward or away from the second shaft 821, the backrest lower support member 54 moves with respect to the back frame 5 including the posture change, and the lumbar support is provided. The protrusion and the depression of the portion 71x and the movement of the rear portion of the seat surface are caused. Hereinafter, the drive mechanism that drives the first shaft 811 in the present embodiment will be described with reference to FIG. 10. Incidentally, FIG. 10 (A) corresponds to FIG. 8 (A), and FIG. 10 (B) corresponds to FIG. 8 (B). The first shaft 811 is provided with one end of a rotating member 83, which is a member for directly driving the first shaft 811, so that it can rotate on a plane parallel to the first shaft 811. Back frame 5
At a position displaced in the front-rear direction from the first shaft 811,
An operation shaft 84 parallel to the first shaft 811 is rotatably provided. Screws 84a and 84b are cut on the operation shaft 84. A nut member 85 that engages with the screws 84a and 84b is attached to the operation shaft 84. Then, the other end of the rotating member 83 is attached to the nut member 85 so that it can rotate on a plane parallel to the operation shaft 84. As a result, when the operating shaft 84 is rotated, the nut member 85 engages with the screws 84a and 84b of the operating shaft 84 and moves along the operating shaft 84, and the nut member 85 and the first shaft 811 of the rotating member 83. The distance in the direction of the operation shaft 84 from the rotation center on the side changes, and the first shaft 811 is driven via the rotating member 83 and slides along the first slide guide portion 511. In the illustrated example, the pair of rotating members 83 are connected to the first shaft 8
11 is rotatably attached. The operation shaft 84 has screws 84a and 84b in the directions opposite to the left part and the right part.
And a pair of nut members 85 are attached to the screw 84
It is engaged with each of a and 84b. A pair of rotating members 83 are rotatably attached to the pair of nut members 85. When the operation shaft 84 is rotated, the pair of nut members 85 move in opposite directions, so that the pair of rotary members 83 both drive the first shaft 811 in the same direction to slide the first shaft 811. The rotation direction of the operation shaft 84 and the sliding movement direction of the first shaft 811 have a one-to-one correspondence, and when the operation shaft 84 is rotated in the reverse direction, the first shaft 811 also slides in the opposite direction. This drive mechanism takes advantage of the features of screw feeding,
The backrest lower support member 54 is both driven and fixed, and it is possible to stop the backrest lower support member 54 at a desired position without separately mounting a mechanism for a stopper. Incidentally, it is preferable that an end portion of the operation shaft 84 is projected outward from the back frame element 51, and a member for a handle or the like (not shown) that can be grasped and operated by a seated person is appropriately provided.

Therefore, according to the present embodiment, the backrest lower support member 54 serving as an operating portion and the back frame 5 serving as a support portion for movably supporting the backrest lower support member 54 are provided, and the backrest support is provided. The backrest 7 or the seat 6 is caused to move by the movement of the member 54,
Slide engaging portions 81 and 82 for slidably engaging the backrest lower support member 54 and the back frame 5 are provided at a plurality of positions, and the backrest supporting is performed by the sliding action of the slide engagement portions 81 and 82. The member 54 is moved with respect to the back frame 5 including at least a change in posture. That is, the slide engaging portions 81 and 82 formed at a plurality of points constitute a supporting point in the movement including the posture change. Therefore, the setting of the slide engaging portions 81 and 82 when implementing a certain specific operation can be configured in various modes, which leads to increasing the degree of freedom in designing the supporting portion. In particular, it is extremely desirable that the chair C having high functionality and complicated structure in recent years has a high degree of freedom in design, for example, in order to prevent interference of members and make the chair compact. In addition, the backrest support member 54 can be easily moved in various ways.

In the chair C according to this embodiment, the slide engaging portions 81 and 82 are provided at two places, and the first slide engaging portion 81 is the backrest supporting member 54. The first shaft 811 set on the side of the back frame 5 and the first shaft 811 provided on the back frame 5 side so as to be slidable along a predetermined line L1, and the backrest lower support member 54 is the first shaft. 811 is engaged with a first slide guide portion 511 that guides so as to be rotatable around 811 and the second slide engagement portion 82 is provided in the back frame 5
And a second shaft 821 that is set on a side that is displaced from the predetermined line L1, and the second shaft 821 that is provided on the backrest lower support member 54 side is slidable, and the backrest support is supported. The member 54 is engaged with a second slide guide portion 544 that guides the member 54 so as to be rotatable about the second shaft 821, and the first shaft 811 is provided.
By driving the first shaft 811 so that the distance between the second back shaft 821 and the second shaft 821 changes, the backrest lower support member 54 moves with respect to the back frame 5 including a posture change. It is configured in. In other words, the backrest lower support member 54 can perform a combined movement of the slide movement and the rotation relative to the back frame 5. Therefore, the amount of movement of the backrest 7 or the seat 6 can be made larger than that of a simple slide mechanism, a rotation mechanism, or the like. Moreover, the first shaft 811 and the second shaft 8
21 or the first slide guide 511,
The layout of the second slide guide portion 544, the slide direction, and other design items are not uniquely limited, and can be appropriately set according to various conditions. Further, it is also effective when a single rotation shaft cannot be provided at a portion serving as a rotation center due to design reasons or the like.

The first slide guide portion 511 and the second slide guide portion 544 are formed as elongated holes, and can be formed by cutting out a required portion of the member, which is simple.

Since the backrest lower support member 54 can be moved and fixed at a desired position by operating the operation shaft 84 which is an operation portion, the backrest 7 or the backrest 7 caused by the backrest lower support member 54 can be fixed. The movement of the seat 6 can be adjusted according to the preference of the seated person.

The backrest surface, which should support the back of the seated person, is deformed by the movement of the backrest lower support member 54, so that the seated person's feeling of use can be significantly improved. In addition, it is possible to realize a high-level function of deforming the backrest surface with a simple configuration. Further, the backrest main body 71, which is deformable at a position in contact with the back, and the backrest reinforcing member 72 attached to the back frame 5 and supporting a part of the back side of the backrest main body 71. Since the backrest main body 71 is deformed at a portion which is not supported by the backrest reinforcing member 72, the backrest 7 is provided with a backup function and a deformation function with a reasonable structure. It is possible.

The backrest surface is formed on an elastically deformable backrest main body 71, and at least one of the lower end and the upper end of the backrest main body 71 is moved by the backrest lower support member 54. Therefore, the backrest surface is deformed so that the backrest 7
The contact feeling and use feeling of the backrest 7 are enhanced, and it is not necessary to bring in a new structure to secure the contact feeling and use feeling of the backrest 7. In addition, the structure for forming the backrest 7 as a backrest and the structure required for deforming the backrest 7 can be efficiently compatible with each other.

By the movement of the backrest lower support member 54,
Since the lumbar support portion 71x, which is a waist-corresponding surface substantially corresponding to the waist of the occupant of the backrest surface, is configured to perform movement including at least one of forward and backward or up and down directional components, It is extremely suitable for improving the sitting comfort. In particular, in the present embodiment, the lumbar support portion 71x projects forward in response to the movement of the backrest lower support member 54 and simultaneously moves upward, so that, for example, the rear portion (Pervic) of the seat 6 is moved to the lumbar support portion 7a.
In the case of being configured to move upwards in conjunction with the protrusion of 1x, it is substantially equivalent to the case where the lumbar support portion 71x relatively performs only the forward protrusion operation with respect to the lumbar of the seated person. , Effective when the same person adjusts the lumbar support position. Of course, the configuration can be effectively used even when the lumbar support position is to be changed in this way according to the difference in physique. Further, as the position of the lumbar support portion 71x is projected and retracted, the curved backrest body 71 is deformed while smoothly changing the degree of the curvature, so that the backrest surface is placed on the seated person's back as much as possible. It becomes possible to use it in a state where it is deformed so as to be in close contact and the backup area is effectively secured.

A supporting portion for movably supporting the backrest lower support member 54 as an operating portion is set on the back frame 5, and the backrest main body 71 supports the lower side thereof by the backrest lower support member 54. Is supported by a backrest reinforcing member 72 of the backrest upper support part, the upper side of which is set above the support part setting portion of the back frame 5, and at least rotatable about a pin 511a which is a horizontal axis extending in the left-right direction. Therefore, when the backrest lower support member 54 is moved so as to push the lower part of the backrest main body 71 upward, the upper part of the backrest main body 71 tilts backward. At this time, there is a refreshing effect that the seated person's back muscles can be bent.

By the movement of the backrest lower support member 54, the rear end portion of the seat is lifted diagonally in conjunction with the lumbar support portion 71x, which is the lumbar support surface, projecting forward. Since it is configured to move including the directional component, the usability is further improved.

The present invention is not limited to the embodiment described in detail above. The operation unit can be brought into the chair in various modes, and for example, a configuration having a plurality of operation units is possible.

In the above embodiment, the first shaft 811 is driven by the operating portion, but the second shaft 821 may be driven instead.

Both the first slide guide portion 511 and the second slide guide portion 544 may be provided on one of the operating portion and the supporting portion. In this case, driving is performed while keeping the distance between the first shaft 811 engaging with the first slide guide 511 and the second shaft 821 engaging with the second slide guide 544 constant. Become.

The first shaft 811 may be fixed to the working unit. At this time, the first shaft 811 is configured to be rotatable with respect to the first slide guide portion 511.
The second shaft 821 may be fixed to the support part and configured to be rotatable with respect to the second slide guide part 544. Of course, the first shaft 811 or the second shaft 821
However, they may be non-rotatably engaged with the corresponding slide guides. In this case, the first shaft 81
The 1st or 2nd axis | shaft 821 is provided in an operation part or a support part so that rotation is possible. The slide guide portion does not always guide the shaft linearly.

Furthermore, the operation unit does not necessarily have to be driven by the operation of the operation unit. In the above embodiment, for example, the seated person may directly load the backrest main body 71 to immerse the lumbar support portion 71x.

Further, in the above embodiment, the backrest 7 is composed of the square-shaped core material 71a and the bag-shaped upholstery material 71b. It may be one of

The specific construction of each of the other parts is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, FIG. 11 shows a reaction force adjusting mechanism F as a modified example. This reaction force adjustment mechanism F
Is configured such that the fixed retainer H1 of the coil spring S is held at the fixed position by a shaft-shaped backup member F10, and the backup member F10 is partially provided and rotatable about a vertical axis F11.
And a screw element F2 having a grip F21 screwed from a direction substantially orthogonal to the displacement direction at a position displaced from the vertical axis F11 of the rotary arm F1, the screw element F2 being The side wall 33 of the support base 3 is penetrated to protrude outward of the side wall 33, and the grip F21 is arranged at the protruding position. When a screw feed operation is applied to the screw element F21 through the grip operation, the rotating arm F1 rotates around the vertical axis F11, and the backup position of the retainer H1 is increased or decreased by increasing or decreasing the initial compression amount of the coil spring S via the backup member F10. It is designed so that it can be moved in the direction in which it is caused. According to this structure, since the bulkiness of the support base 3 in the direction orthogonal to the bottom wall 31 is suppressed, it is possible to effectively pursue the thinning of the support base 3 and its periphery.

[0050]

As described above in detail, according to the present invention, it is possible to increase the degree of freedom in designing the operation portion that causes the backrest or the movement of the seat. In addition, it is easy to make the motion unit perform various movements.

[Brief description of drawings]

FIG. 1 is a front view of a chair according to an embodiment of the present invention.

FIG. 2 is a side view of the chair according to the embodiment.

FIG. 3 is a vertical cross-sectional view showing the vicinity of a support base of the chair according to the same embodiment.

FIG. 4 is a plan view showing a seat support of the chair according to the embodiment.

FIG. 5 is a perspective view showing a state in which the seat support of the chair according to the embodiment is attached to the support base.

FIG. 6 is an exploded perspective view showing the structure of the backrest of the chair according to the embodiment.

FIG. 7 is an exploded perspective view showing structures of an operating portion and a supporting portion of the chair according to the embodiment.

FIG. 8 is a conceptual diagram showing the mechanism and operation of the operation unit of the chair according to the embodiment.

FIG. 9 is a conceptual diagram showing the mechanism and operation of the backrest of the chair according to the same embodiment.

FIG. 10 is a conceptual diagram showing an operation unit of the chair according to the embodiment.

FIG. 11 is a view showing a modified example of the above embodiment.

[Explanation of symbols]

C ... Chair 5 ... Back frame (support) 54 ... Back support member (operating part) 6 ... 7. Backrest 81 ... First slide engaging portion 811 ... the first axis 511 ... First slide guide section 82 ... Second slide engaging portion 821 ... second axis 544 ... Second slide guide portion

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3B084 BA00 EA03 EB05 EC01 GA03                       HA02 HA06                 3B091 AA04 AB01 AB02 AC04 LA01                 3B099 AA02 BA02 BA04 CA30 DA06

Claims (9)

[Claims] 1. An operation part and a support part for movably supporting the operation part, wherein the movement of the operation part causes backrest or seat movement. Slide engaging portions that slidably engage the operating portion and the support portion are provided at a plurality of locations, and the operating portion performs a movement with respect to the supporting portion at least including a posture change by the sliding action of each of the slide engaging portions. A chair characterized by being configured as follows. 2. The slide engaging portion is provided at two locations, wherein the first slide engaging portion is provided on the first shaft set on the operating portion side and on the supporting portion side. A first guide for sliding the first shaft along a predetermined line, and for guiding the operating unit so as to be rotatable about the first shaft.
It is made by engaging with the slide guide part of
The second slide engagement portion is provided on the support portion side and is set at a position displaced from the predetermined line, and the second shaft provided on the operation portion side is slidable and the operation is performed. And a second slide guide portion that guides the portion so as to be rotatable about the second shaft, and drives the first shaft toward or away from the second shaft. By doing so, the operation unit is configured to move with respect to the support unit including a posture change.
The listed chair. 3. The first slide guide portion or the second slide guide portion.
The chair according to claim 2, wherein at least one of the slide guide portions of the above is a long hole. 4. The operation part is moved by the operation of the operation part and can be fixed at a desired position.
The chair described in Nos. 3 to 3. 5. The chair according to claim 1, wherein a part or the whole of the backrest surface for supporting the back of the seated person is deformed by the movement of the operating portion. 6. The backrest surface is formed on an elastically deformable backrest body, wherein at least one of a lower end portion and an upper end portion of the backrest body is moved by the operating portion. The chair according to claim 5, wherein the leaning surface is configured to be deformed. 7. A movement of the operating portion is configured so that a waist corresponding surface of the backrest surface that substantially corresponds to the waist of a seated person makes a movement including at least one of forward and backward directional components. 7. The chair according to claim 5, wherein 8. The support portion is set on a back frame,
8. The backrest main body is supported by the operation portion on the lower side thereof, and is supported by the backrest upper support portion set on the upper side thereof above the support portion setting portion of the back frame. Chair. 9. The chair according to claim 1, wherein the rear portion of the seat surface is configured to move including a vertical component by the movement of the operating portion.